North American Network Operators Group

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Re: Time to check the rate limits on your mail servers

  • From: Adi Linden
  • Date: Thu Feb 03 21:19:48 2005

> > How about using SMTP AUTH and verifying the envelope MAIL FROM to match
> > the actual user authenticating?
> that doesn't work if you have more than one email address.

You should know all your users email addresses. It shouldn't be too
difficult to match the 'mail from' address with the user account. The only
caveat would be that [email protected] would actually have to use the
hotmail smtp server to send mail.

> > This will make SPAM traceable and
> > hopefully ultimately users aware that their PC is sending junk.
> auth is sufficient to make email traceable to your own customers.

And how is that? There isn't necessarily anything in an email indicating
that it originated from an SMTP AUTH authenticated user. While a header
could be added, it isn't a mandatory thing.