[Dovecot] getting rid of old spam from +spam Maildir ? [ auto purging spambox]

[Wojciech Puchar]

>> if I simply delete mail files from the file system, is that a 'bad thing' ?
>> [...]
> IMHO 7 days is dangerously too short. False positives during vacations
> happen too ;-)
>
> I would suggest at least 30 days (as used by Gmail).
>
or use spam system that NEVER actually receive something it thinks it is 
spam, but provide proper SMTP response.