[webmin-l] Virtualmin Mailbox quota needs doubling to work

[Unknown Q. <web...@un...>]

Hi

i'm trying to clean up a server with lots of domains run under Virtulamin

i wanted to make the mailbox users stop storing their stuff on the server 
after they had downloaded it to their home / office PC

i'm running Debian Linux 3.0
with Webmin 1.250
and Virtualmin version 2.60

i'm trying to impose a limit of 25 Mb per user mailbox
and have set these limits in the domain / mailuser in Virtulamin

Home directory quota = 25000 kB
Mail file quota = 25000 kB

this seems to work fine in stopping extra e-mails going into the mailbox if 
the mailbox is just under 25mb full (they just sit in the mailqueue)

but the problem i'm getting is that users are unable to collect their 
e-mails with outlook express etc due to this error message

>>>
There was a problem logging onto your mail server. Your Password was
rejected. Account: 'TEST', Server: 'IP Number',
Protocol: POP3, Server Response: '-ERR [SYS/TEMP] Unable to copy mail spool
file, quota exceeded (122)', Port: 110, Secure(SSL): No, Server Error:
0x800CCC90, Error Number: 0x800CCC92
<<<

the users mailbox is set up by Virtualmin to
/var/spool/mail/domain.tld.username
and some users have these boxes as well - depending i think on if they have 
used Webmail
/home/domain.tld/homes/username/mail/virus-mail
/home/domain.tld/homes/username/mail/spam-mail
/home/domain.tld/homes/username/mail/mail-trash
/home/domain.tld/homes/username/mail/sent-mail
/home/domain.tld/homes/username/mail/saved-drafts
/home/domain.tld/homes/username/mail/Sent
/home/domain.tld/homes/username/mail/Trash
/home/domain.tld/homes/username/mail/Drafts

it has been suggested to me that
"The way qpopper (the mail retrieval program) works is that it copies the 
entire mailbox when someone pops logs in. So the user needs a quota of 
double the size of their mailbox for this to work.

E.g. if the users mailbox is 25 meg in size, he will need a quota of 50 meg 
to be able to log on and check his email. The stupid thing is the users 
mailbox can grow about 25 meg, but this will prevent him from pop logging 
in.

I don't know if there is a "fix" for this."
or if i'm completely missing a simple setting / point / idea / brain cell

any help / guidance gratefully received

Regards

Martyn