qmail and 451: Problems sending emails - cannot relay now

[poppsworld.com]

Hello,

i'm facing problems sending emails via a centos 5.2 server running plesk 8.6. Some emails cannot be send and remain in the remote mail-queue for a long time.

When i look at /usr/local/psa/var/log/maillog i can find some entries like this:

Sep 1 04:04:58 zappbrannigan qmail: 1220234698.314549 starting delivery 774: msg 20418317 to remote [email protected]
Sep 1 04:04:58 zappbrannigan qmail: 1220234698.315237 status: local 0/10 remote 1/20
Sep 1 04:04:58 zappbrannigan qmail: 1220234698.315332 starting delivery 775: msg 20418317 to remote [email protected]
Sep 1 04:04:58 zappbrannigan qmail: 1220234698.315399 status: local 0/10 remote 2/20
Sep 1 04:04:58 zappbrannigan qmail-remote-handlers[6592]: Handlers Filter before-remote for qmail started ...
Sep 1 04:04:58 zappbrannigan qmail-remote-handlers[6593]: Handlers Filter before-remote for qmail started ...
Sep 1 04:04:58 zappbrannigan qmail-remote-handlers[6592]: [email protected]
Sep 1 04:04:58 zappbrannigan qmail-remote-handlers[6592]: [email protected]
Sep 1 04:04:58 zappbrannigan qmail-remote-handlers[6593]: [email protected]
Sep 1 04:04:58 zappbrannigan qmail-remote-handlers[6593]: [email protected]
Sep 1 04:04:58 zappbrannigan qmail: 1220234698.427619 delivery 775: deferral: 212.227.15.134_does_not_like_recipient./Remote_host_said:_451_cannot_relay_now_to_<[email protected]>,_please_try
_again_later/Giving_up_on_212.227.15.134./
Sep 1 04:04:58 zappbrannigan qmail: 1220234698.427754 status: local 0/10 remote 1/20
Sep 1 04:04:58 zappbrannigan qmail: 1220234698.450704 delivery 774: deferral: 212.227.15.169_does_not_like_recipient./Remote_host_said:_451_cannot_relay_now_to_<[email protected]>,_ple
ase_try_again_later/Giving_up_on_212.227.15.169./

Now i am not quite sure if this is failure on my or on the receiving side. Sending a simple email via Telnet seems to work... The message "cannot relay NOW" points me, that this is a temporary problem. But the error remains after days...

Anyone can help me with this issue?

Best regards
Lars

 

[Satoriya]

Looks like there is a problem with remove server as mail logs said that Plesk mail server was able to deliver email but for some reason this mail was rejected.

If such responce is coming from one exact server it is better for you to refer to administrator responsibe for this mail server.