Guides, tools & comparisons
Every Jetmail guide, free email tool and provider comparison in one place: DNS, deliverability, warmup, Outlook and Gmail how-tos and more.
Free tools
SPF Record Checker
Check your SPF record in seconds. Free SPF checker that counts DNS lookups against the 10-lookup limit and also tests DKIM, DMARC and MX.
DMARC Checker & Generator
Look up any domain's DMARC record, see what the policy does, and generate a valid DMARC TXT record with a safe rollout plan.
Domain Health Checker
Test your domain's email health in seconds: SPF, DKIM, DMARC and MX checked live, with plain-English fixes for anything failing.
Spam Word Checker
Paste your email to find spam trigger words, link and formatting problems that hurt inbox placement, with a fix for each one.
Email Signature Generator
Build a clean, professional email signature for Gmail, Outlook and Apple Mail in a minute. Free, no sign-up, copy the HTML.
DKIM Checker
Free DKIM checker and analyzer: enter a domain and selector to see the published DKIM key, its approximate size and any problems, plus SPF, DMARC and MX.
Products
Cold Email Infrastructure
Cold email infrastructure in minutes: Google & Microsoft mailboxes, domains, SPF/DKIM/DMARC and 1-click connection to your outreach tool.
Pre-warmed Inboxes
Buy pre-warmed Google and Microsoft inboxes that are ready to send the day you get them. Skip the 2–4 week warmup; DNS is already configured.
Pricing
Pricing for Google, Microsoft and pre-warmed cold email inboxes. Compare plans, calculate your monthly cost and see how Jetmail stacks up.
Google Workspace Business Email
Buy Google Workspace inboxes and business email accounts on your own domains, with SPF, DKIM and DMARC set up automatically. From $2.5 per mailbox.
Mailboxes for Instantly
How to add Google and Microsoft mailboxes to Instantly, how Instantly warmup and forwarding domains work, and how to log in and connect in one click.
Mailboxes for Smartlead
How to put Google and Microsoft email accounts into Smartlead, how Smartlead warmup works, and the fastest way to add mailboxes in bulk.
Comparisons
Zapmail Alternative
Looking for a Zapmail alternative? Compare Zapmail and Jetmail on price per mailbox, pre-warmed inboxes, setup and features, with a cost calculator.
InboxKit Alternative
Looking for an InboxKit alternative? Compare InboxKit and Jetmail on price per mailbox, pre-warmed inboxes, setup and features.
Icemail Alternative
Looking for an Icemail alternative? Compare Icemail and Jetmail on price per mailbox, pre-warmed inboxes, setup and features.
Zapmail vs InboxKit
Zapmail vs InboxKit side by side: price per mailbox, Microsoft and pre-warmed options, setup and integrations, plus a third option to consider.
Zapmail vs Instantly
Zapmail vs Instantly's done-for-you inboxes: pricing, setup, pre-warmed options and how each connects to your sending tool.
Cheapinboxes Alternative
Comparing Cheapinboxes? See price per mailbox, real Google and Microsoft inboxes, pre-warmed options and setup side by side with Jetmail.
Premium Inboxes Alternative
Looking for a Premium Inboxes alternative? Compare mailbox pricing, pre-warmed inboxes, domains and integrations with Jetmail.
Hypertide Alternative
Hypertide vs Jetmail: price per mailbox, Google and Microsoft inboxes, pre-warmed options, setup time and integrations compared.
Maildoso Alternative
Maildoso vs Jetmail: what kind of mailboxes you get, price per mailbox, pre-warmed options and how each connects to your sequencer.
Mailforge Alternative
Mailforge, Infraforge or Jetmail? Compare mailbox type, price per mailbox, pre-warmed options, domains and setup.
Zapmail Review
An honest Zapmail review: plans and pricing after year one, pre-warmed mailboxes, refund terms, pros and cons, and who it suits.
Best Cold Email Infrastructure
The best cold email infrastructure providers compared on price per mailbox, Google vs Microsoft vs SMTP, pre-warmed inboxes and setup.
Google Workspace vs Microsoft 365
Google Workspace vs Microsoft 365 compared on price per user, mailbox storage, apps, admin and sending limits, plus which one to choose for cold outreach.
Google Workspace vs Gmail
Google Workspace vs free Gmail: custom domain email, storage, sending limits, admin controls and cost per user, plus when it is worth upgrading to Workspace.
Best Email Warmup Tools
The best email warmup tools compared on price per mailbox, warmup network, free plans and spam tests, plus when built-in warmup or pre-warmed inboxes win.
Instantly vs Smartlead
Instantly vs Smartlead side by side: plan prices, contacts and email limits, warmup, inbox rotation, agency features and API, plus which one fits your team.
Instantly vs Apollo
Instantly vs Apollo compared on pricing, contact data, sequences, mailbox limits and deliverability, and why many teams use Apollo leads with Instantly.
Lemlist Alternatives
Looking for a lemlist alternative? Compare Instantly, Smartlead, Apollo, Reply.io and more on price per seat, senders, warmup and multichannel features.
Guides
Gmail & Outlook SMTP Settings
Gmail SMTP server, ports and sending limits, plus Outlook and Microsoft 365 SMTP settings — in one copy-paste table.
Email Deliverability Guide
What email deliverability is, the Gmail, Yahoo and Microsoft sender requirements, spam-rate thresholds and a step-by-step checklist to reach the inbox.
Cold Email Guide
What cold email is, how to write one, subject lines that get opened, follow-up templates and how many mailboxes you need for your volume.
Cold Email Domains
Why cold email needs secondary domains, how many domains and inboxes your volume needs, which extensions to use and what it costs.
Email Warmup
How email warmup works, a week-by-week warmup schedule for new inboxes and domains, warmup tools compared, and when to skip it with pre-warmed inboxes.
Best Cold Email Software
The best cold email software and outreach tools compared on price, mailboxes, warmup and features, including Instantly vs Smartlead.
Lead Generation Services
How B2B lead generation services and companies work, what they cost, how they compare with tools and in-house outbound, and how to choose.
DMARC Fail & Policy Errors
Fix DMARC fail, “DMARC policy not enabled”, “no DMARC record found” and 554 5.7.5 permanent error evaluating DMARC policy, step by step.
SPF vs DKIM vs DMARC
What SPF, DKIM and DMARC each check, how they work together, the differences in one table, and what record each one needs.
DKIM Setup Guide
Set up DKIM for Google Workspace and Microsoft 365, add the record at GoDaddy, Cloudflare or Namecheap, and fix DKIM fail errors.
Google Workspace MX Records
The current Google Workspace and Gmail MX record values, what an MX record is, how to add them at your DNS host and how to verify.
Google Workspace SPF Record
The Google Workspace SPF record explained part by part, how to add it, combine it with other senders, and stay under 10 lookups.
Office 365 SMTP Settings
Microsoft 365 / Office 365 SMTP server, port, encryption and sending limits, plus how to enable SMTP AUTH and fix common errors.
Inbox Placement Test
What inbox placement is, how seed-list placement tests work, how to read results by provider, and how to fix emails landing in spam.
Outlook Out of Office
Set an out of office automatic reply in new Outlook, classic Outlook, Outlook on the web and the mobile app, with message templates.
BCC in Outlook
How to add BCC in Outlook on Windows, Mac, web and mobile, how to show the BCC field permanently, and when to use BCC vs CC.
Recall an Email in Outlook
Recall or replace a sent message in Outlook, what the recipient sees, why recalls fail, and safer alternatives like delayed sending.
Schedule an Email in Outlook
Schedule emails in new Outlook, classic Outlook, Outlook on the web and mobile, plus delay-delivery rules and best times to send.
Bulk Delete Gmail
Bulk delete Gmail emails by sender, date, size or label with search operators, select-all tricks, and how to free up storage fast.
Email Sign-Offs
Email sign-offs and closings for every situation: professional, warm, friendly and funny, plus which ones get more replies.
Email Salutations
Email salutations and greetings from formal to casual, which to use when, ones to avoid, and how to address unknown recipients.
Resignation Email Subject Line
Clear resignation email subject lines for every situation, a copy-paste resignation email template and what to include.
Job Application Email
What to write when emailing a resume, a job application email template, how to follow up, and how to reply to a rejection.
RocketReach Guide
What RocketReach is, how its pricing and Chrome extension work, how accurate it is, and how it compares with alternatives.
ZoomInfo Chrome Extension
How the ZoomInfo Chrome extension works, how to install it, what it costs and the best alternatives for finding B2B contacts.
Apollo.io Guide
How Apollo.io's email finder, Chrome extension and lead database work, what it costs, and how to send to Apollo leads safely.
Lusha Guide
How to log in to Lusha and use its Chrome extension, what Lusha's plans cost, and the main alternatives for B2B contact data.
GMass Review
What GMass does inside Gmail, its pricing, Chrome extension and MCP server, how it compares with Mailchimp and cold email tools.
Hunter.io Guide
How Hunter.io finds and verifies email addresses, what its plans cost, how accurate it is and which alternatives to consider.
Google Workspace Pricing
Google Workspace plans compared: Business Starter, Standard and Plus prices, annual vs flexible billing, storage and limits, and what email costs per user.
How to Make a Business Email
How to make a business email on your own domain: free and paid options, Google Workspace vs Microsoft 365 costs, the DNS records to add and each step in order.
Cold Email Agency
What a cold email marketing agency does, common pricing models, how to vet one, and what it costs to run cold email lead generation in-house instead.
IMAP vs SMTP
IMAP vs SMTP explained: one receives and syncs mail, the other sends it. See how they differ from POP3, the ports and encryption for each, and Gmail settings.
Why Emails Go to Spam
Emails going to spam? Find the cause fast: missing SPF, DKIM or DMARC, a cold domain, spam complaints, risky links or content, and the fix for each one.
Email Deliverability Services
What email deliverability services, consultants and agencies do, what an audit covers, typical costs, how to vet an expert, and what you can fix yourself.
Cold Email Subject Lines
60+ cold email subject lines sorted by situation, the rules behind subject lines that get opened, what to avoid, and how to test them without hurting delivery.
Cold Email Follow-Up
How to follow up on a cold email: how many follow-ups to send, how long to wait between them, copy-paste follow-up templates and a sales follow-up sequence.
Sales Email Templates
20 sales email templates for B2B: cold intros, follow-ups, referrals, breakups and the Tim Ferriss cold email, with notes on when each one works best.
Cold Email vs Cold Calling
Cold email vs cold calling compared on cost per conversation, reach per rep, timing and legal rules, plus how to combine both channels in one sequence.