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Knowledgebase: Linux
Some clients face a 30-60 second delay when trying to send/receive mail. Why so?
Posted by Matthew Whittaker on 03 July 2006 09:20 AM
This article applies to Dedicated Servers running the Plesk control panel.

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.

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