Don't have an account? Sign up
If you're already signed up, please sign in
Message Submission (Port 587) — the standard email message submission service on TCP port 587, normally requiring authentication and commonly securing the session with STARTTLS.
Email delivery involves several roles and protocols: a client creates a message, servers transfer it with SMTP, and the recipient reads it through IMAP, POP3, or webmail. Transport encryption and sender authentication solve different problems.
Message Submission (Port 587) — the standard email message submission service on TCP port 587, normally requiring authentication and commonly securing the session with STARTTLS.
The mechanism participates in message creation, transfer, receipt, or storage. Its role depends on the delivery stage and whether it operates between a client and server or between mail servers.
Verify the server, port, encryption, authentication method, DNS records, and SMTP logs. For delivery errors, record the exact response code and the stage at which it occurred.
