kolab/nullmailer issue

[Johannes Graumann]

Hello,

If my logs tell me like so:

Sep  6 13:01:07 morannon nullmailer[17763]: smtp: Failed: 552 Error: message
too large
Sep  6 13:01:07 morannon nullmailer[4856]: Sending failed:  Permanent error
in sending the message

does that mean that there's a local message being send that doesn't fit the
smtp size maxima?

How do I increase those and how do I track and purge these messages?

Thanks for any hints and sorry for my naivitee,

Joh