Tomasz Suchodolski a écrit : > Hello, > > Today i had a mail that stuck in the queue with error: > lost connection with mail.someserver.xxx [xx.xxx.xxx.xxx] while > sending RCPT TO), so i looked at logs. > During the session, their server sent mail: > from=<> to=<[email protected]> > proto=SMTP helo=<mail.someserver.xxx> and got greylisted each time. > After this, mail ended in deferred. So I whitelisted their > adress(postgrey), flushed the queue. Again their server > sent a test message, got answer "user unknown" and finally my mail was > delivered. > > Is it common to send such testing messages ? >
that's called SAV (sender address verification). this is generally not recommended (except for people who really know what they are doing), but some servers do that. it is well know that SAV and greylisting don't marry well...
