550GREETING
From Qmail-LDAP Wiki
Rejects a connection right away with a 550 in the greeting line and starts in a dummy mode where only QUIT works unless SMTP550DISCONNECT is set -- in that case the connection will closed immediately after printing the greeting.
Default:
off
Affects:
qmail-smtpd
Example:
"" "Go away!"
Note:
- You can set this in tcpserver if you want to reject messages from an IP address permanently.
- If no string is given it will default to "Sorry, your message has been administratively denied. (#5.7.1)".
- The timeout is reduced to 20 seconds to prevent starvation.
- 550GREETING has precedence over 421GREETING.
