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MigoSMTP
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Free tools

Free checkers and generators for senders

No sign-up needed. Use them on any domain.

Auth checkSPF, DKIM, DMARC
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Added
BlocklistIP and domain
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Added
WarmupPlan the ramp
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Added
HeadersTrace the path
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Free
Pick a toolCheckers and generators for authentication, blocklists and warmup.
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Domain
example.com
Check
Checking
One field
Instant
Enter a domain or IPOne input is enough. Results appear in seconds.
List A
Clear
List B
Clear
List C
Clear
List D
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List E
Clear
List F
Clear
203.0.113.10
Parallel
Fast
Query the blocklistsYour address is checked against major lists in parallel.
name@example.com
SyntaxFormat is valid
regex ✓
DomainMX records found
MX mx.example.com
MailboxAccepts mail
RCPT TO → 250 OK
Deliverable
Three checks
No email sent
Verify an addressSyntax, domain and mailbox checks in one pass.
Raw headers
Received: from mx1 by mx2
Authentication-Results:
spf=pass dkim=pass
dmarc=pass
Return-Path: <b@x.com>
From: Acme <hi@acme.io>
Subject: Hello
Date: [date]
Hop 1 · app.example[ms]
Hop 2 · mx1.migosmtp[ms]
Hop 3 · mx.gmail[ms]
SPF pass
DKIM pass
DMARC pass
Trace
Auth
Analyze headersPaste raw headers and see the hops and verdicts.
Daily volume
Target volume
D1
D2
D4
D6
D8
D11
D14
Day by day
Exportable
Plan a warmupTurn a target volume into a day-by-day ramp.
Pick
Enter
Lookup
Probe
Headers
Plan
Calculator Warmup calculatorBuild a daily ramp schedule for a new IP.Open tool → Checker Authentication checkerTest SPF, DKIM and DMARC.Open tool → Checker Blacklist checkLook up an IP or domain on blocklists.Open tool → Checker Email validatorSyntax and domain check for an address.Open tool → Analyzer Header analyzerPaste headers to trace a message.Open tool → Generator DMARC generatorBuild a DMARC record.Open tool →

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