Saksham Jain

Endy Inboxes is a done-for-you private cold email infrastructure provider that, per its homepage, puts dedicated US IPs on your domains and prices mailboxes at roughly $2-$2.50 each, with publicly listed, self-serve tiers. The verdict up front: Endy hits a genuinely attractive combination on paper, dedicated private IPs (usually a premium feature) at budget per-mailbox prices, with a stated 30-minute setup and domain ownership retention. The catches are a thin independent review base (a young brand with a handful of Trustpilot reviews at the time of writing), a soft "book a demo" gate, and the usual reminder that private-infrastructure deliverability still depends on how you send.

Saksham Jain9 min read

ColdSire is a premium-positioned cold email infrastructure provider with one distinctive idea: according to its homepage, instead of putting your accounts on infrastructure full of other cold emailers, it places them in a pool "mixed with real businesses" and caps the cold-email share at 15%. Mailboxes are publicly advertised at $6/month for Google Workspace or Microsoft 365, with per-domain workspace isolation. The verdict up front: ColdSire's premium-pool and domain-isolation model is a thoughtful answer to why cheap inboxes burn, and the self-reported scale numbers ("100K+ mailboxes," "5,000+ companies") lend marketing credibility. The catches are a higher per-inbox price than the budget players, a core "15% cap" claim that buyers cannot independently audit, and a thin base of neutral third-party reviews at the time of writing.

Saksham Jain9 min read

Email Astra sells pre-warmed Google Workspace and Microsoft 365 inboxes for cold email, advertised at a flat $5 per inbox, so you skip the typical 14-21 day warmup and (per Email Astra) get to first send within hours. The verdict up front: the concept is legitimate (pre-warmed inboxes are a real, useful category) and the publicly advertised feature list is strong on paper, dedicated US IPs, unlimited burn replacement, a master inbox, and 24/7 deliverability engineers. But this is a caution-flagged review: published pricing varies widely across sources ($2.75 to ~$13 depending on plan and where you look), the on-site "4.9/5 (145 Reviews)" headline figure is far larger than the public third-party review base we could find, payments are strictly non-refundable, and the buying motion runs primarily through WhatsApp.

Saksham Jain10 min read

If you found this review shopping for standalone cold email mailboxes, here is the verdict up front: ColdIQ Inboxes is not a self-serve inbox product, it is the infrastructure layer bundled inside ColdIQ's full-service GTM agency engagement. ColdIQ is a well-regarded outbound agency (one of Clay's Elite Studio partners, the highest tier within Clay's partner program) and the inboxes it provisions, authentic Google Workspace, Microsoft 365, and Azure accounts, come as part of a managed monthly retainer rather than mailboxes you buy by the seat. ColdIQ does not publish pricing, but third-party agency directories report retainers in the ~$2,000-$8,000/month range (with some sources placing the typical floor closer to $5,000). This review explains the model, who it fits, and why DIY infrastructure buyers should look elsewhere.

Saksham Jain8 min read

HyperInboxes (often searched as "HyperInbox") is a premium-positioned Google Workspace mailbox provider for cold email, advertising fast 12-hour setup, pre-configured authentication, and free inbox replacements. The verdict up front: on paper, HyperInboxes presents as a competent, fast, premium-leaning Google mailbox provider, but there are two things every prospective buyer needs to know first. As of the time of writing, the homepage displays the notice "We're Not Accepting New Purchases at This Time," indicating new signups are paused while it focuses on existing customers, and prior coverage references user reports of mailbox disconnection issues with sending tools (which we could not independently re-verify).

Saksham Jain8 min read

wizeMails is one of the few cold email infrastructure providers built around monitoring rather than just provisioning. Per its homepage, every client gets a dedicated server and IP, and a "Signal Intelligence Engine" that scans every domain, IP, and mailbox every 15 minutes and responds automatically when it detects a threat. Pricing starts at $179/month with everything included. The verdict up front: wizeMails appears genuinely differentiated, its core thesis ("you don't have a sending problem, you have a landing problem") is well aligned with how cold email actually fails, and the always-on, auto-remediating monitoring is the right architecture most providers lack. The catches are that it is young and small-scale (the homepage states 150+ domains deployed; self-reported), it is private SMTP infrastructure rather than Google/Microsoft inboxes, and you connect your own warmup tool.

Saksham Jain9 min read

SkySenders is a founder-built, private cold email infrastructure platform with a strong publicly advertised isolation model: per its homepage, every domain gets its own dedicated server, paired with dedicated IPs, automated DNS, a unified reply inbox (SkyBox), and real-time health monitoring. Public tier pricing starts at $59/month and runs through $269/month for the Essentials tier, plus a custom Enterprise option. The verdict up front: SkySenders presents as a well-architected, agency-friendly private-infrastructure provider that does the important things right on paper, domain isolation to prevent cross-contamination, monitoring so problems don't fester, and a unified inbox so replies don't get lost. The catches are that it is a younger founder-led operation, the 99% inbox-delivery claim is self-reported, the independent review footprint (G2/Trustpilot/Reddit) is thin at the time of writing, and third-party coverage references a strict no-refund policy.

Saksham Jain9 min read

Inbox Navigator is a done-for-you, multi-platform cold email infrastructure provider with an appealing combination on paper: per its homepage, dedicated-IP isolation (not shared resold inboxes) at budget pricing, starting at $3 per Google inbox. The verdict up front: Inbox Navigator presents as a solid, transparent option in this tier, with publicly advertised diversified infrastructure (Google, Microsoft 365, SMTP, and prewarmed) under one roof, dedicated IPs and isolated workspaces, no setup fee, and fast, hands-on service. The catches are that it is a younger brand ("200+ founders" self-reported), the 99% placement figure is self-reported, and some on-site testimonials appear templated.

Saksham Jain9 min read

MightyMail is an enterprise-positioned cold email infrastructure provider built around Microsoft Azure Outlook inboxes. Per third-party directory listings, it provisions 99 high-reputation inboxes per domain, fully done-for-you, with email copy audits and 24/7 Slack support included. The verdict up front: MightyMail's concept is reasonable, direct Azure infrastructure rather than cheap reseller accounts, high density to cut per-inbox cost, and helpful extras most providers do not bundle. But it carries an unusual cluster of transparency and trust gaps: no public pricing, no public API documentation we could find, no independent reviews on G2/Trustpilot/Reddit at the time of writing, a no-refunds policy referenced in third-party coverage, and a multi-business-day setup (one prior write-up cited up to 5 business days; we could not independently re-verify the exact figure).

Saksham Jain9 min read

Mailin (mailin.ai) is a private cold email infrastructure provider that sells inboxes across SMTP, Google, and Microsoft on dedicated servers and IPs, with a strong founder-led support reputation and per-mailbox economics that go as low as roughly $1.20 at scale. The publicly advertised plans start at the Solopreneur tier ($299 per month for 200 accounts) and step up to Business ($749 per month for 500 accounts) and Enterprise ($1,499 per month for 1,000 accounts, with $1 per additional account). This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain11 min read

LUNATRO.MX (lunatro.mx) is a newer cold email infrastructure provider built on Microsoft Azure, with a clean, aggressive entry offer: $199 per month for a subscription that includes 4 pre-configured domains, 100 inboxes per domain (400 total), and an allowance of up to 30,000 emails per month. The verdict up front: the inbox-count headline is striking, but the binding constraint is the 30,000-email monthly cap, which works out to roughly 1,000 sends per day for $199 per month. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain10 min read

InfraBoxes (infraboxes.com) is a deliverability-first cold email infrastructure provider with a clean, low pricing model: $3 per private mailbox or $2.50 per Google mailbox, with warmup, monitoring, and burn protection bundled into every mailbox. The headline differentiator is bundling, the things most providers sell separately (warmup and monitoring) are included in the per-mailbox price, and private mailboxes run on dedicated stacks isolated every 10 domains. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain11 min read

GoBoxMate (goboxmate.com) is a done-for-you Google Workspace inbox provider for cold email: Google Workspace inboxes on US / EU IPs, with SPF, DKIM, DMARC, warmup, and profile pictures handled for the buyer, delivered in 48 hours. The publicly advertised plans are $38.88 per month for 10 inboxes (with add-ons at $3.50 per inbox) and $99 per month for 30 inboxes (with add-ons at $3.25 per inbox), with no minimums and no setup fees. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain10 min read

MailPool (mailpool.ai) is a cold email infrastructure platform built around one strength: creating and managing inboxes across multiple providers, its own shared network, Google Workspace, Microsoft 365, or dedicated servers, from a single no-code dashboard with automated authentication and blacklist monitoring. The platform is an official Google Cloud and Microsoft Partner, with publicly stated scale of 3,000+ customers, 35,000+ domains managed, and 250,000+ inboxes created. Pricing is volume-based and varies by inbox provider rather than a single flat rate. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain11 min read

AeroSend is a cold email infrastructure provider that advertises private, isolated infrastructure, with every 10 domains placed on their own dedicated servers and IPs, paired with automated "domain burn alerts." Publicly advertised pricing is slot-based, starting at $120 per month for a 10-domain slot (30 mailboxes) and dropping to $93 per slot at higher volume. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain11 min read

AgentMail is an email inbox API for AI agents: it lets developers create programmatic inboxes so software agents can send, receive, and act on email in real time. It is API-first and well-funded, but it is a different category from cold email infrastructure. This review summarizes what AgentMail is, its published usage-based pricing, what we could and could not independently verify, and why teams shopping for cold-outreach mailboxes should weigh the category difference before evaluating it.

Saksham Jain10 min read

ScaledMail is a fully-managed cold email infrastructure provider whose distinguishing feature is letting buyers blend Google Workspace, Microsoft Outlook, and SMTP mailboxes in one volume-sized package that the ScaledMail team builds and runs. Publicly advertised pricing is per provider: $3.50 per Google mailbox, $50 per Outlook domain (25 mailboxes), and $3.75 per SMTP domain (4 mailboxes), with reporting as a paid add-on. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain11 min read

Mission Inbox is an email infrastructure-as-a-service platform that positions itself as a deliverability-first alternative to SendGrid, Mailgun, and Google Workspace resellers. The product centers on isolated infrastructure ("Cubes"), 2 to 3 dedicated IPs by volume, an AI Pre-send Shield, and a real REST API with SDKs in six languages. The publicly advertised All-in-One MI plan starts at $199 per month for 30 inboxes, 10,000 sends, and 20 credits, with overage at roughly $1 per additional 1,000 sends and $2 to $3 per extra mailbox. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain11 min read

SuperWave is a fully managed "pipeline-as-a-service" cold email provider that bundles infrastructure, lead data, an AI campaign engine, and a dedicated deliverability specialist, all under a headline 95%+ inbox-placement SLA. The provider does not publish pricing, and the only public figure is a user-reported $5,000 deposit billed annually upfront with no monthly option. Two material caveats: SuperWave's own homepage FAQ admits the service hovers around 80 to 90 percent placement year round, and independent review-aggregator coverage of the SuperWave cold-email product is minimal. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before committing.

Saksham Jain12 min read

Smartlead Mailboxes, marketed as SmartSenders, is a procurement layer inside the Smartlead sequencer that resells mailboxes from third-party providers (including Zapmail, Mailreef, InboxKit, and Pager.ai) and connects them automatically to Smartlead campaigns. Publicly advertised pricing starts at $4.50 per mailbox per month plus $13 per domain per year for Google and Outlook options. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain11 min read

Instantly Mailboxes, marketed as DFY ("Done-For-You") accounts and pre-warmed accounts, is an in-platform provisioning layer that sets up domains and Google Workspace mailboxes inside the Instantly cold email platform. Publicly advertised pricing is $15 per domain per year and $5 per Google account per month for DFY, with pre-warmed accounts at a higher per-mailbox tier. A meaningful editorial flag: Instantly's help center states the provider retains domain ownership and administrator access for purchases made through this service. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh.

Saksham Jain11 min read

Mailscale is a cold email infrastructure provider that advertises a fast-provisioning mailbox product with automated DNS configuration, dedicated specialist support on higher tiers, and a marketing-level deliverability guarantee. Publicly advertised pricing starts at $79 per month on the Solopreneur tier and runs to $1,000+ per month on the Unlimited tier. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain11 min read

Slicey is a cold email infrastructure provider that advertises isolated Microsoft Outlook inbox panels priced per-domain, with white-glove setup, automatic inbox swapping, and unlimited domain swaps. Publicly advertised pricing is $97 per domain (standard) or $49 per domain at 25 or more domains, with each domain advertised as including 49 to 99 Outlook inboxes and 15,000 emails per month. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain10 min read

CheapInboxes is a bulk reseller of Google Workspace and Microsoft 365 mailboxes targeted at cold email teams. According to the provider's homepage, pricing is volume-tiered from $3.50 per mailbox per month at low volume down to $2.80 at 1,000+ mailboxes. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain11 min read

HyperTide is a cold email infrastructure provider that advertises automated provisioning across what the provider describes as Google, Microsoft, and Entra inboxes, with each order placed in what the provider describes as an isolated tenant. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain11 min read

InfraForge is the private cold email infrastructure product within the Salesforge ecosystem. The provider advertises a slot-based pricing model starting at $4 per mailbox per month on annual billing, with a minimum order of 10 slots, dedicated IPs available as a $99-per-month add-on, and a referenced SOC 2 attestation. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain12 min read

MailReef advertises a dedicated cold email infrastructure product with a per-server pricing model, a dedicated IP per server, and a per-server mailbox cap referenced as 150+ mailboxes. Publicly listed pricing is $240 per month on the annual Agency plan or $249 on the month-to-month Agency Flex plan, plus a $0.001-per-send fee. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain12 min read

Premium Inboxes is a Google Workspace and Microsoft 365 mailbox reseller that markets a service-oriented setup model with manual DNS verification and Slack-based support. The provider references aggregate platform figures such as 2,000+ customers, 250,000+ inboxes in circulation, and a target setup time of under six hours. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain11 min read

PuzzleInbox is a cold email infrastructure provider that advertises pre-warmed Google Workspace and Outlook 365 inboxes priced per-inbox rather than per-month-subscription. Publicly advertised pricing starts at $0.35 per Outlook 365 inbox and $3.00 to $4.50 per Google Workspace inbox. The product is supported by a large SEO content engine on the PuzzleInbox blog. This review summarizes the provider's public claims, what we could and could not independently verify, and the operational context buyers should weigh before purchasing.

Saksham Jain11 min read

Smartlead is $39-$379/mo with per-workspace pricing and 16 native integrations. Instantly is $47-$358/mo with a 450M+ lead database and unlimited warmup on every plan. Most SERP listicles get the pricing wrong because Smartlead's Unlimited Prime tier at $379 is new and Pro is 90K emails (not 150K). Here's the verified 2026 comparison.

Saksham Jain15 min read

Infraforge sells dedicated-IP cold email infrastructure at $3-4/mailbox. Instantly sells a cold email platform (sequencer, warmup, CRM) from $47/mo with Google Workspace accounts as a shared-infrastructure add-on. They aren't substitutes. Here's the honest framing with verified 2026 pricing and the stack pattern that actually works.

Saksham Jain12 min read

One Reddit thread summed it up: 'zapmail gives you gmail accounts, maildoso provides smtp-based sending.' That's mostly right, but both products are more nuanced. Here's the verified 2026 comparison of pricing, placement testing quotas, Microsoft 365 coverage, and the ZapShield vs self-healing question.

Saksham Jain14 min read

Mailforge is pure shared-IP SMTP at $2-3/mailbox with a 10-slot minimum. Maildoso ships SMTP + Google Workspace Combo plans at $2-3/mailbox with placement testing, self-healing, and monitoring bundled. Here's the real 2026 comparison: feature by feature, with verified pricing.

Saksham Jain13 min read

Primeforge ships real Google Workspace and Microsoft 365 mailboxes at $4.50/mailbox. Smartlead ships a four-tier AI outreach platform from $39 to $379/mo that doesn't own any mailbox infrastructure of its own. Most buyers comparing the two should be buying both. Here's why, plus when each is the wrong call.

Saksham Jain14 min read

Mailforge sells shared-IP SMTP mailboxes from $2-3/mo. Instantly sells a $47/mo cold email sender with an unlimited warmup pool, CRM, and a Google-only mailbox add-on. They aren't substitutes. Here's how to pick, when to use both, and what to do if neither fits.

Saksham Jain13 min read

CheapInboxes offers pre-warmed Google and Microsoft mailboxes from $2.80/mo, but lacks monitoring and placement testing. Here are 7 alternatives with better monitoring and features, led by InboxKit with plans from $39/mo.

Saksham Jain11 min read

Looking for a Hypertide alternative? Here are 7 cold email infrastructure platforms compared, with InboxKit leading with plans from $39/mo for real Google Workspace + Microsoft 365, isolated warmup ($3/mailbox/mo add-on) and InfraGuard.

Saksham Jain10 min read

Infraforge offers the cheapest per-mailbox cost, but shared IP deliverability issues and lack of monitoring cost more than you save. Here are 6 better alternatives ranked by overall value, with InboxKit leading with plans from $39/mo for real Google + Microsoft mailboxes.

Saksham Jain15 min read

Inframail offers unlimited inboxes at a flat $129/month. Here are 7 alternatives with different pricing models, including InboxKit with plans from $39/mo for real Google Workspace + Microsoft 365 accounts.

Saksham Jain10 min read

Looking for a Mailpool alternative? Here are 7 cold email infrastructure platforms ranked by value, led by InboxKit with plans from $39/mo for real Google Workspace + Microsoft 365, isolated warmup available at $3/mailbox/mo.

Saksham Jain9 min read

Looking for a Mailreef alternative? 7 platforms compared on pricing, warmup quality, monitoring, and integrations. InboxKit leads with plans from $39/mo, isolated warmup ($3/mailbox/mo add-on) and InfraGuard.

Saksham Jain10 min read

Looking for a Premium Inboxes alternative? 7 platforms compared on pricing, deliverability, and features. InboxKit offers plans from $39/mo with real Google Workspace + Microsoft 365, isolated warmup ($3/mailbox/mo add-on) and InfraGuard.

Saksham Jain9 min read

SPF softfail means your sending IP isn't authorized in your SPF record and the `~all` mechanism told receivers to accept-but-mark. It breaks DMARC alignment and drives spam routing. Here's how to fix it.

Saksham Jain9 min read

Microsoft 365 runs its own filter stack. Exchange Online Protection, with different rules than Gmail. Here's how to read the headers, decode the scores, and fix cold emails landing in Junk or Quarantine.

Saksham Jain11 min read

Postmaster Tools shows Bad or Low reputation when Gmail's internal classifier has flagged your domain. Fixing it takes a specific pause-diagnose-rebuild protocol, not just waiting it out.

Saksham Jain11 min read

A soft bounce is a temporary SMTP failure (4xx code) that your sequencer will retry. But repeat soft bounces are a warning sign. Here's how to decode the error, fix the cause, and keep reputation intact.

Saksham Jain10 min read

Not every blacklist hit is fatal, and not every fix is a removal request. This guide walks through diagnosing which blacklist, which trigger event, and whether your domain is worth rehabilitating.

Saksham Jain12 min read

Gmail showing dmarc=fail means your SPF or DKIM passed on the wrong domain, an alignment mismatch, not a missing record. Here's how to find which one and fix it.

Saksham Jain11 min read

Promotions is not spam, but it cuts reply rate by 40-60% because recipients never open it. Here's what Gmail's classifier actually scores and the fixes that move cold emails to Primary.

Saksham Jain10 min read

If your cold emails are landing in the Gmail spam folder, one of three things is broken: authentication, reputation, or content. Here is how to diagnose the exact cause in under 10 minutes and fix it.

Saksham Jain11 min read

Mailforge offers shared IP mailboxes at $2/mo, Primeforge provides real Google/Microsoft at $3.50-4.50/mo. After a 60-day test, the deliverability gap is 16 points (63% vs 79%). InboxKit bridges the gap with plans from $39/mo for real accounts.

Saksham Jain14 min read

ZapMail provides real Google Workspace (plans from $39/mo). Mailforge uses shared IP at $2-3/mo. After 8 months, ZapMail wins on deliverability but InboxKit beats both with Microsoft 365 + Azure support, isolated warmup, InfraGuard monitoring, and 24+ integrations.

Saksham Jain12 min read

Both Zapmail and Primeforge offer real Google mailboxes, but Zapmail wins on warmup speed and support. InboxKit has nearly identical pricing to ZapMail ($39/$99/$299 plans) and beats both with Microsoft 365 support, isolated warmup, and InfraGuard monitoring.

Saksham Jain11 min read

ZapMail offers real Google Workspace and Microsoft 365 mailboxes with pre-warmed accounts and a clean UI, but has no monitoring, no inbox testing, and only 5 integrations. InboxKit wins on infrastructure quality with Azure mailbox support, isolated warmup, InfraGuard, and 24+ integrations at nearly identical pricing.

Saksham Jain10 min read

Primeforge offers real Google Workspace and Microsoft 365 mailboxes at $3.50-$4.50/mo with automated DNS and 30-minute provisioning. After testing 30 mailboxes for 3 months: 80% inbox placement, solid domain quality, but the Forge ecosystem cost adds up fast.

Saksham Jain9 min read

Mailforge offers the cheapest mailboxes in the market at $2-3/mo, but shared IP infrastructure means 60-68% inbox placement vs 80-85% with real accounts. Here is the full review with real numbers.

Saksham Jain10 min read

Maildoso offers SMTP mailboxes and real Google Workspace accounts (Combo bundles only) at competitive bulk pricing, with inbox placement tests every 3 days and 14-day self-healing recovery. No Microsoft 365 at any price, and monitoring is less granular than InfraGuard.

Saksham Jain8 min read

Inframail offers private email infrastructure for cold email. After testing for 3 months, here is an honest review covering deliverability, pricing, features, and how it stacks up against InboxKit.

Saksham Jain10 min read

The complete guide to setting up cold email infrastructure from scratch. Domains, DNS records, mailboxes, warmup, monitoring, and sequencer integration. everything you need in one place.

Saksham Jain14 min read

SPF records tell receiving servers which IP addresses can send email on behalf of your domain. Get it wrong and your emails go straight to spam. Here is the complete setup guide.

Saksham Jain10 min read

DKIM proves your emails were not tampered with in transit. Without it, inbox placement drops 10-15%. Here is how to set it up correctly for Google Workspace and Microsoft 365.

Saksham Jain10 min read

DMARC tells receiving servers what to do when SPF or DKIM fails. The wrong policy can get your emails rejected. Here is the correct DMARC setup for cold email domains.

Saksham Jain9 min read

Google Workspace warms up faster and has better Gmail deliverability. Microsoft 365 provides diversity and Outlook advantage. The best strategy uses both. InboxKit offers both Google and Microsoft with plans from $39/mo.

Saksham Jain11 min read

The formula: 1 domain per 50 daily emails, 2-3 mailboxes per domain. Sending 500 emails/day? You need ~10 domains and 25 mailboxes. Full calculator and strategy guide inside.

Saksham Jain10 min read

Scaling cold email requires proportional infrastructure. Here is the exact domain, mailbox, and monitoring requirements at each volume level from 100 to 10,000 sends per day.

Saksham Jain9 min read

.com is the safest domain extension for cold email. .io and .co are solid second choices. .net and .ai are acceptable. Avoid .xyz, .info, .biz, and obscure TLDs that trigger spam filters.

Saksham Jain10 min read

DNS configuration is where most cold email setups break. This guide walks through SPF, DKIM, and DMARC setup step by step, with provider-specific instructions, common mistakes, and validation tools.

Saksham Jain20 min read

Google and Yahoo's sender requirements (effective February 2024) changed cold email permanently. Here's exactly what's required, what's enforced, and how InboxKit handles compliance automatically.

Saksham Jain10 min read

Google Workspace allows 2,000 emails/day. Microsoft 365 allows 10,000. But new accounts start much lower, and exceeding limits triggers suspensions. Here are the exact numbers from Google and Microsoft's documentation.

Saksham Jain7 min read

InboxKit works with 24+ sequencer platforms. Here is how to connect your mailboxes to each one, with exact steps, connection methods, and troubleshooting tips.

Saksham Jain7 min read

Every step from buying a domain to sending your first campaign. Based on 10,000+ domain setups on InboxKit.

Saksham Jain10 min read