[EMAIL PROTECTED] wrote:

>> Which is why I qualified my reply with "if the sending relay is a valid
>> SMTP client."

> Maybe we are just arguing semantics but anything that connects to
> my mail server and speaks RFC821 is valid.  I might not like what
> it feeds me but that is what ClamAV/SpamAssassin is for. :)

OK, let me be precise:  By "valid SMTP client", I mean one that
generates a DSN in response to a 5xx status code.

> Returning a 5xx message is neither hard or resource intensive.

I'm not arguing that.  I'm just disagreeing with the statement that
it's a good idea.

> Then even in the unlikely event of a false positive the sender
> knows.

This is so unlikely that the backscatter risk outweighs the benefit.

Regards,

David.
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