New guide: how to warm up a dedicated IP without hurting your reputation. Read now →
Log in
MigoSMTP
Book a demo Start free
Help center · Topic

Domains and DNS

Sending domains and DNS records.

Help assistant
AI
My domain says not verified
search_help("domain verify") → 2 articles
check_domain(example.com) → DKIM missing
Your DKIM record is not published yet.
Add it at your DNS host, then recheck.
Verify a domain
DKIM setup
Cites articles
Hands off to humans
Get an answer before you open a ticketThe help assistant reads the help center and answers with the exact article. If it cannot solve it, it hands the chat to a person with the context attached.
Getting started[n] articles
+ Add
Added
Deliverability[n] articles
+ Add
Added
Billing[n] articles
+ Add
Added
API[n] articles
+ Add
Added
Organised
Complete
Or browse by topicGetting started, deliverability, billing and more.
Summary
Summary
Check
Check
Delist
Delist
Prevent
Prevent
Fix a blocklisted IP
Step by step
1. Find the list
2. Fix the cause
3. Request removal
Copy
Steps
Screenshots
Clear step-by-step answersShort articles with the exact steps.
Troubleshoot delivery
Check authentication
Check blocklists
Review bounces
Check content
Review volume
Self-serve
Fast
TroubleshootA checklist to find the cause yourself.
Contact support
Subject
Emails going to spam
Details
Started on [date]
Send
Ticket opened
Humans
Quick
Still stuck? Ask usOpen a ticket with the details we need.
Ticket openedWe got it
Agent repliedNext steps
ResolvedConfirm fix
You send
Agent reads
Agent replies
Ack
Fix
Closed
Notified
Tracked
We reply where you areUpdates arrive by email, so you never refresh a page.
Ask the assistant
Browse
Read
Try
Ticket
Reply
Domains and DNS Reverse DNS, PTR Records and HELO Names: Why They Matter for EmailReceiving servers often check that the IP address sending mail has a reverse DNS name that points back to the same address. This guide explains PTR r… 13 Oct 2026 · 6 min readRead article → Domains and DNS DNS Record Troubleshooting for Email: TXT Length, TTL, Propagation and Registrar QuirksMost email authentication failures are not mistakes in the record you meant to publish. They are quirks in how a DNS panel stores it: a long DKIM key… 10 Oct 2026 · 14 min readRead article → Domains and DNS Multiple Email Vendors on One Domain: How to Manage SPF, DKIM and DMARC Without Breaking AnythingMost companies end up with a marketing platform, a CRM, a helpdesk, a transactional provider and an office mailbox all sending as the same domain. Th… 6 Oct 2026 · 13 min readRead article → Domains and DNS Protecting Parked and Non-Sending Domains: Null SPF, DMARC Reject, Null MX and Dangling DNS CleanupDomains you never send from are still domains attackers can forge. This guide explains why parked, defensive, old-brand and typo domains get spoofed,… 30 Sep 2026 · 12 min readRead article → Domains and DNS BIMI Setup: Show Your Brand Logo in the Inbox (Requirements and Steps)BIMI lets mailbox providers show your verified brand logo next to your messages. It needs DMARC at enforcement, a correctly prepared SVG logo and, fo… 29 Sep 2026 · 4 min readRead article → Domains and DNS SPF Permerror: How to Fix Too Many DNS Lookups (the 10-Lookup Limit)An SPF record that triggers more than ten DNS lookups returns a permanent error, and receivers treat the check as failed. This guide explains exactly… 22 Sep 2026 · 4 min readRead article → Domains and DNS Custom Return-Path and Tracking Domains: Setup, Alignment and HTTPSA custom return-path domain lets SPF align with your From domain, and a custom tracking domain brands your links. This guide explains how both work, … 25 Aug 2026 · 7 min readRead article → Domains and DNS DKIM Key Rotation: Selectors, Key Length and a Safe Rotation PlanDKIM keys should not live forever. This guide explains how selectors let you run two keys side by side, which key length to choose, how often to rota… 18 Aug 2026 · 7 min readRead article → Domains and DNS How to Verify Your Sending Domain: DNS Records, Propagation and FixesVerifying a sending domain proves you control it and lets mail be signed and authenticated as you. This guide explains what verification checks, whic… 11 Aug 2026 · 8 min readRead article → Domains and DNS Sending Subdomain Strategy: Structuring Domains for Multiple Brands, Products and Mail TypesWhen you send for several brands, products, regions or mail types, the way you split domains and subdomains decides how reputation, authentication an… 28 Jul 2026 · 11 min readRead article → Domains and DNS DMARC Alignment Explained: SPF and DKIM Alignment, Relaxed vs StrictA message can pass SPF and DKIM and still fail DMARC. The reason is alignment: the domains that SPF and DKIM check must match the domain in the visib… 16 Jun 2026 · 7 min readRead article → Domains and DNS How to Read DMARC Aggregate Reports and Safely Move to p=rejectA DMARC aggregate report is a daily XML file from each mailbox provider that lists every source sending mail as your domain and whether it passed SPF… 17 Mar 2026 · 7 min readRead article → Domains and DNS How to Authenticate a Sending Domain: SPF, DKIM and DMARC Setup GuideTo authenticate a sending domain you publish three DNS records: SPF (which servers may send), DKIM (a signature that proves the message was not alter… 14 Apr 2025 · 11 min readRead article →

Still stuck?

Our support team will take a look and reply by email.

Contact support

Start sending in minutes.

Create an account, add your domain and send your first email.

Start free Talk to sales