On Fri, 12 Jan 2001 22:31:53 -0800, you wrote:

>customers), against a table of allowed IP addresses. I really
>don't think the from email address on the email makes any
>difference here, but rather the IP it originates from.
At least one of the ISP's I'm using checks the "from" and just denies
any mail that doesn't have a valid address, and it doesn't only check
the domain, it checks the mailboxname too.  Apparently (so they claim)
they do this as a means of making sure users of their services have
set up their mail client properly.
Can't really say this is bad practice, I'm getting LOTS of mails where
a reply will return with "mail address unknown" or something similar.
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