Jon Rust <[EMAIL PROTECTED]> wrote:
> I agree with most of what you said here Dave, but I'd have to say
> that rejecting mail with envelope sender domains that don't exist is
> a good thing (either an A or CNAME record, or an MX). If for no other
> reason, you can't bounce back to them. I don't consider this aspect
> an arms race with spammers, just common sense. You give me a false
> from address, I reject your mail.
Except you're supposing that if a domain is valid, you can resolve it. They
aren't the same thing. I see the daily mail logs here every day, and we always
have a few legitimate mails which are rejected by a receiver doing this;
the problem is, their DNS is down, or their resolver is broken, or their
BIND has decided to take a field day. Result? They reject our legitimate
mail.
Admittedly, it's a small number (5-50 a day out of thousands of deliveries)
but I'm sure the mail users at those remote sites would be less than
pleased to find out that their email is being needlessly delayed because
of an anti-spam measure that doesn't buy you much.
Charles
--
-----------------------------------------------------------------------
Charles Cazabon <[EMAIL PROTECTED]>
GPL'ed software available at: http://www.qcc.sk.ca/~charlesc/software/
Any opinions expressed are just that -- my opinions.
-----------------------------------------------------------------------
