need your help.
Every day I receive automatic emails from the domain (the domain was changed for obviously reasons, ok) abcd.efg.hi, but today, I've checked zimbra.log and I've seen this:
NOQUEUE: reject: RCPT from unknown[xxx.xxx.x.xxx]: 450 4.7.1 Client host rejected: cannot find your hostname, [xxx.xxx.x.xxx]; from=<email@example.com> to=<firstname.lastname@example.org> proto=ESMTP helo=<mail2.abcd.efg.hi>
What's happening? I suppose that the problem is with the guys at the domain abcd.efg.hi, isn't it? Maybe the reverse.
Thanks for any help.