strange error with mailer daemon
I have working Zimbra 6.0.0 AG.
Today I receive a rare report for an user:
The user sends one email the last week (April 1st).
We have a bad configuration with our DNS Reverse and the domain2.com didn't accept the message, the log show:
Apr 1 22:35:51 webmail postfix/smtp: 336682F0BFD: to=<email@example.com>, relay=mx.domain2.com[115.212.164.02]:25, delay=330444, delays=330443/0.02/0.47/0.06, dsn=4.7.1, status=deferred (host mx.domain2..com[115.212.164.02] said: 450 4.7.1 Client host rejected: cannot find your hostname, [188.8.131.52] (in reply to RCPT TO command))
but, when the mailer-daemon send the "Undelivered Mail Returned to Sender" it's sent to firstname.lastname@example.org (the cc account).
I don't understand why the mailer-daemon send the reply to cc(email@example.com) user and why it don't reply to from user(firstname.lastname@example.org).
We use the web client to send emails.
thanks for your help.