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

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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.