Limit Mail Message

Can I add this line in /etc/postfix/main.cf to limit the Mail message size for all users:

message_size_limit = 5000

I'm asking this because I received a mail that some users are over there quota limit but I can't see this in there directory. Maybe someone received a large mail.

 

Thanks.
However, I'm not sure this has anything to do with quota. I'm receiving this mail twice a day, 03:15 AM, 15:15PM.

 

Yes and no. The postfix limit has an effect on how big the mails may be, that you can send over the server. The quota message refers to available disk space which is affected by emails lying around in your users' maildirs as well as uploaded files in the userdirs, the main web dir, ...

These two issued are only losely coupled if at all.

 

There must be a mistake in the calculation.
When I check the diskspace on that server:
# du -sh /var/www/web2/user/*
148K 2_bart
148K 2_boris
272K 2_jakob
148K 2_jasper
...

And here are some parts of the mail I receive twice a day:

The following users are near or already over their quota limit on server xxxxx:
===================================================

Username: 2_jakob
Used Storage Space: 11.00 MB
Allocated Storage Space: 10.00 MB
----------------------------------------------------------------------------

Username: 2_jasper
Used Storage Space: 11.00 MB
Allocated Storage Space: 10.00 MB
----------------------------------------------------------------------------

Username: 2_bart
Used Storage Space: 11.00 MB
Allocated Storage Space: 10.00 MB
----------------------------------------------------------------------------

Username: 2_boris
Used Storage Space: 11.00 MB
Allocated Storage Space: 10.00 MB
----------------------------------------------------------------------------

etc....

 

Indeed:
2_jasper +- 11264 10240 11264 5days 17 0 0

/tmp/
drwx------ 2 2_jasper web2 4096 2007-11-06 05:05 clamav-33b9b38a47ced4a1ed04311e39b22a9c

Only 5MB, mail is empty.