[RCU] ext-mx01.kolabsys.com lists.roundcube.net delivery problems encountered

Simon Loewenthal simon at klunky.co.uk
Wed Nov 27 14:22:25 CET 2013

Hi there,

Roundcubes mail server still has problems with accepting external email. 
  Who should I contact?
Perhaps somebody could tell me if this MX record is correct : 

Nov 27 13:23:58 lt postfix/smtp[28143]: 0C78B95: 
to=<users at lists.roundcube.net>, 
relay=ext-mx01.kolabsys.com[]:25, delay=1.4, 
delays=0.4/0.01/0.94/0.05, dsn=5.7.1, status=bounced (host 
ext-mx01.kolabsys.com[] said: 553 5.7.1 
<users at lists.roundcube.net>: Sender address rejected: not logged in (in 
reply to RCPT TO command))
Nov 27 13:23:58 lt postfix/smtp[28143]: 65B2B96: 
to=<users at lists.roundcube.net>, 
relay=ext-mx02.kolabsys.com[]:25, delay=0.28, 
delays=0.01/0/0.12/0.15, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 

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