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Originally Posted by Toreador
Filtering by content is one thing, and shouldn't be done by the ISP - apart from virus-containing attachments that could easily be blocked, either by bouncing the email or removing the attachment. Filtering by origin is a different matter and is what other ISPs seem to do.
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There is agreement in quite a few circles that the behaviour of bouncing emails with viruses, or stripping bad attachments and sending through the rest of the email is a bad thing. In fact, some viruses explicitly use the behaviour of some "virus scanners" that bounce the emails to deliver their payload to their intended victim, by sending the email to a non-existent address from the target address. For some reason, the bounce often includes the virus attachment, and bypasses some scanners.