robg...@nospammail.net: > But they keep retrying to resend the email that's getting REJECTed. > Every 15mins for the past 9+ hours since the 1st message was sent > and got rejected.
RFC 5321, the definition of SMTP says:
4.2.1. Reply Code Severities and Theory
...
5yz Permanent Negative Completion reply
The command was not accepted and the requested action did not
occur. The SMTP client SHOULD NOT repeat the exact request (in
the same sequence).
Wietse
