Surely it must be possible for an SMTP server to do sender-verify in a
different way, such as by querying its own table of valid accounts.
It would be a boon for spammers. They would be able to send lot of
tests to determine which E-mail addresses are valid.
I don't see how they would not get the same results from such a set of
tests no matter what method is used to verify senders.
This is a test on the "From" address of a sender using SMTP, not a test on
the "To" address of a recipient. If a spammer is going to send out a bunch
of emails with randomly generated "From" addresses and keep the ones that
don't get bounced, I don't see why it matters how the SMTP server decides
which ones to bounce.
Anyway, I think it would probably be better and faster for the SMTP server
to read the bounce message and verify addresses for which the message
contains "over quota", since that's a valid existing address.
Ken Dibble
www.stic-cil.org
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