build1 publisher
Port 25 decides which email check you can actually run
An MX lookup is one DNS query proving a domain has mail servers. Confirming a specific mailbox means opening port 25 from an IP that Gmail will answer, so MailProbe ships that check only in its self-hosted build.
Publishers:dev.to
Reality
- Evidence40
- Adoption
- Insufficient
- Hype gap+10
- Incentives70
- Confidence55