----- Transcript of session follows -----
... while talking to mx1.exemple2.ru.:
>>> DATA

<<< 553 5.1.8 <me@domen.com>... Domain of sender address root@exemple.domen.ru does not exist
550 5.1.1 <me@domen.com>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)

--mANH8jYr041720.1227460125/exemple.domen.ru
Content-Type: message/delivery-status

Reporting-MTA: dns; exemple.domen.ru
Received-From-MTA: DNS; localhost
Arrival-Date: Sun, 23 Nov 2008 23:08:45 +0600 (NOVT)

Final-Recipient: RFC822; me@domen.com
Action: failed
Status: 5.1.8
Remote-MTA: DNS; mx1.exemple2.ru
Diagnostic-Code: SMTP; 553 5.1.8 <me@domen.com>... Domain of sender address root@exemple.domen.ru does not exist
Last-Attempt-Date: Sun, 23 Nov 2008 23:08:45 +0600 (NOVT)

Почту отправляю через sendmail, прописал адрес
postmaster: root,me@domen.com
По cron высылаются отчёты

Можно посылать почту без регистрации DNS, в чём проблема?