> the idea might sound simple and great, iow really efficient, BUT: what
> prevents spam from being sent with exactly this phrase in the subject?

We use Yahoo Groups for the SWREG mailing list and every email that
Yahoo Groups sends out has [SWREG] inserted at the beginning of every
message subject field.

On the odd occasion when one of these messages is trapped at Spamcop
it is really easy to spot so that I do not accidentally report the
sender for spamming and whitelist him so I can receive future emails
sent by that sender.

To date I have ever seen a spam with [SWREG] at the beginning and do
not expect to in reality.

-- 
Best wishes,


Steve Lee
http://jumbocruiser.com
Tel +44 7768 211612


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