On 2016-02-19 12:25, György Kövesdi wrote: > > Yes, this is a Thunderbird message. I only see that it tries to access the > mailbox, and the server denies it. On the server I do not see anything in > /var/log/messages (however, the authenticated pop3 and imap transactions are > logged in details). I am not familiar with the Courier logging system, please > help me how to see what happens. I found it: there is a network problem between two mail servers and the sender cannot reach my server. Sorry for inconvenience.
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