RE: Migrating GMail to Dovecot using imapc

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I more or less said that, you are a mail administrator yes? then you know bloody damn well that 99% of spam checks are carried out after reception of the mail​

depends what you define by reception. We perform spam checks on the DATA portion of the mail reception and can refuse a message in that segment. Therefore, spam check is done on the message before accepting it.

of course that is the most logical and efficient approach catching spam as soon as possible.