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The problem with rejecting mail as spam explicitly rather than silently dropping it into the spam bin is that it makes it really easy to tune spam so that it gets past your filter. Maybe it doesn't matter so much if it's just for a few people, but if something like that was popular there would be people figuring out how to work around it.

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If this were even a tiny bit of an issue then way more spam would hit people's inboxes. Rejecting explicitly is the right thing to do. It's not always possible, but it's definitely preferred.

Source: I wrote some of the original SpamAssassin and worked in anti-spam for over 10 years.

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