[unisog] sendmail spam filtering

Reg Quinton reggers at ist.uwaterloo.ca
Mon Jun 10 19:00:33 GMT 2002

> I have been toying with a sendmail milter that checks that an envelope
sender address (SMTP
> MAIL FROM) actually exists and will receive e-mail before accepting
e-mail for delivery.

What would happen if the sending site implemented the same strategy?
Wouldn't they connect back to you and then you connect back to them and
then ....etc. until one of you ran out of sockets?

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