Why check MX before sending?
Confirms DNS is propagated and helps debug misconfigured domains after migration. Pair with DNS Lookup for SPF and DKIM TXT records.
MX lookup — find mail exchange records for any domain.
Verify which mail servers receive email for a domain. Essential when setting up SMTPServer, migrating providers, or troubleshooting delivery.
What is an MX record?
MX (Mail Exchange) DNS records tell the internet which servers accept incoming mail for your domain. Lower priority numbers are tried first. When sending through SMTPServer, your domain's MX records may still point to your existing inbox provider — only outbound SMTP settings change.
No MX records found?
The domain may use A/AAAA fallback (rare), records may not have propagated yet, or the domain name was mistyped. Wait up to 48 hours after DNS changes.