telnet mx3.peterhost.ru 25
Trying 80.93.57.58...
Connected to mx3.peterhost.ru.
Escape character is '^]'.
220 mx3.z8.ru ESMTP Exim 4.67 Wed, 04 Jul 2007 12:02:03 +0400
HELO szko.ru
250 mx3.z8.ru Hello szko.ru [62.141.102.140]

MAIL FROM: reznik@rosman.ru500 unrecognized command
^R
MAIL FROM:reznik@rosman.ru
250 OK
RCPT TO:ahmethanov.t@szko.ru
250 Accepted
data
354 Enter message, ending with "." on a line by itself
test
test
.
250 OK id=1I5zpA-000108-OW
quit
==================================================

TEST
ahmethanov.t@szko.ru
Your message 
 
  To:      ahmethanov.t@szko.ru 
  Subject: TEST 
  Sent:    Wed, 4 Jul 2007 11:47:47 +0400 
 
did not reach the following recipient(s): 
 
ahmethanov.t@szko.ru on Wed, 4 Jul 2007 11:47:49 +0400 
    Ошибка связи с сервером электронной почты получателя по протоколу 
SMTP. Обратитесь к системному администратору. 
    <moshqsrvexc1.rosman.local #5.5.0 smtp;550 Invalid HELO/EHLO 
(moshqsrvexc1.rosman.local) [#1006].>