How to increase the message size

Mon May 12 01:44:06 CEST 2014

How do In increase the size of e-mails I can send or accept.
There is a way of setting it in the kolab-webadmin but it seems to have no effect.
-- 
Best regards
Thomas Spuhler

All of my e-mails have a valid digital signature
ID 60114E63
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