Errors
No MX Record Found — Your Domain Can't Receive Email
MX tells the world where to deliver mail for your domain. No MX = bounces. Sending outbound still works — only inbound breaks.
What MX does
Other servers look up MX for yourdomain.com to find where to deliver mail. No MX — no delivery.
Examples (verify with your provider)
Google Workspace: aspmx.l.google.com (priority 1)
Microsoft 365: yourdomain-com.mail.protection.outlook.com
Fastmail: in1-smtp.messagingengine.com (priority 10)
Zoho: mx.zoho.com (priority 10)
Fix it step by step
Step 1 Run DNS Preflight → does the MX card show records?
Step 2 Log into your DNS provider (Cloudflare, Namecheap, etc.)
Step 3 Add MX records from your email provider’s setup docs
Step 4 Set lower number = higher priority for multiple MX
Step 5 Wait up to 48 hours for propagation
Step 6 Re-run DNS Preflight → confirm MX records appear
Run DNS Preflight to verify MX
Open DNS Preflight →Also read:
DMARC ·
Google Workspace SPF
FAQ
What happens with no MX record?
Inbound mail to your domain bounces — there’s nowhere to deliver.
Does missing MX affect sending?
No — MX is inbound only. You can still send — replies won’t reach you if MX is missing.
What priority should I use?
Lower number = higher priority. Single server often 10; multiple use 10, 20, …
MX exists but mail still bounces — why?
MX must point to a hostname with an A record. The server must accept SMTP on 25.
I deleted MX by accident — will mail queue?
Senders retry for days — restore MX fast and most queued mail can still arrive.