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I have fully functional mail server which uses maildrop as a delivery agent. Now i need to implement quota for each mailbox. I've found some articles which describes quota configuration with patch to postfix - but i found some posts that patched postfix quota functionality works only when virtual delivery agent is used. So its useless for me.

Is there any better way to implement mail quota rather than manual maildir size checks in maildrop scripts?

Quota settings will be stored in a database (as all settings - its virtual user environment)

Using dovecot is not a solution (like: how to repair car -> buy a new one...)

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Is there a reason you don't use an IMAP server like Dovecot and its builtin quota functionality? –  SvW Jan 24 '13 at 9:00
Most of howtos i found about mail server configuration uses courier-imap. I tried to find differences between courier and dovecot, and most of them seems to say that dovecot is slower. –  WombaT Jan 24 '13 at 9:29
The question is not which system is faster (I know no reliable comparison) but which one is fast enough and help you solve your problem, and I've never heard complaints about Dovecots performance. –  SvW Jan 24 '13 at 10:23
I have already working server based on courier. To use quota with dovecot i need to migrate to dovecot what needs a lot of time which i dont have. Thats why i asked to way to configure quota on courier(maildrop) –  WombaT Jan 24 '13 at 10:40
Then please add this info to your question... –  SvW Jan 24 '13 at 10:41

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