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sender was rejected, Remote host said 478 no relay available

Superkikim

Regular Pleskian
Hi there,

I have a problem on my server. Many messages are not being delivered. It seems I get a reject always from the same server. The message I find in the logs is (obviously, I have altered emails):

Aug 21 18:37:27 plesk01 qmail: 1250872647.704657 delivery 1327: deferral: Connected_to_212.74.176.17_but_sender_was_rejected./Remote_host_said:_478_some.email@mydomain.com_no_relay_available/


I also get sometimes this kind of messages:

Aug 17 09:49:58 plesk01 qmail: 1250495398.228507 delivery 514686: deferral: 217.169.130.206_does_not_like_recipient./Remote_host_said:_450_<some_name@customer.com>:_Recipient_address_rejected:_Policy_Rejection-_you_are_Greylisted,_Please_try_later./Giving_up_on_217.169.130.206./

Could anyone tell me what I am supposed to do with such a messages ?
 
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