Qmail not Run (Swsoft Faq)

[elexis_linux]

Check to make sure that the name servers that are listed in /etc/resolv.conf have not been shut down and are working properly.

It's also very possible that the name servers in the /etc/resolv.conf file are working fine but the IP from where the client is accessing the server is not reverse resolvable. It is misconfiguration on the client's side, you can offer the client to contact his ISP to make the IP reverse resolvable. If you wish you could turn off the reverse lookup completely.

For Linux servers the -Rt0 option needs to be added to the beginning of the server_args line in the /etc/xinetd.d/smtp_psa file:

server_args = -Rt0 /var/qmail/bin/relaylock ....

It is necessary to restart xinetd to apply the changes:

# /etc/init.d/xinetd restart