[Exim] Malformed SMTP response

Hello.

My Exim has problems sending mail to one specific site.

Trying a delivery results in this (part of dialogue):

Connecting to mx15.nameplanet.com [62.70.3.45.25] ... connected
SMTP<< 220 mx15.nameplanet.com ESMTP
SMTP>> EHLO mail.mitt-eget.com

  SMTP<< 250-mx15.nameplanet.com
         250-AUTH=LOGIN
         250-PIPELINING
         250 8BITMIME

SMTP>> MAIL FROM:<>
SMTP>> RCPT TO:<user@???>
SMTP>> DATA
SMTP<< 250 ok
SMTP<<
LOG: 0 MAIN
Malformed SMTP response from mx15.nameplanet.com [62.70.3.45] after DATA:

Isn't DATA supposed to return a 300 response? Is the 250 the problem?
Is there any fix?

-- 
Göran Larsson     hoh AT mitt-eget DOT com