roy at gnomon
Feb 28, 2004, 9:15 AM
Views: 1458
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Problems with interaction of SRS and Challenge/Response
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As a followup to my previous message on the interaction of SES and
similar schemes with other anti-spam technology, there are also
similar issues with SRS that need to be addressed.
If a message is sent through an SRS forwarder to a system with employs
a challenge/response system such as TMDA, each message will appear to
be from a new sender, and will generate a new challenge (see my
previous message for more discussion).
I'm not immediately sure what the solution is. X-Primary-Address
doesn't work to fix this, for two reasons:
1. It's probably unreasonable to require all senders to add an
X-Primary-Address header to all mail they send, just in case it
gets forwarded.
2. It wouldn't help, even if they did, since the domain in the
X-Primary-Address header wouldn't match the domain in the envelope
sender, so TMDA would ignore the header.
There is a similar problem with the interaction with greylisting
systems.
Any thoughts? (And apologies if this has been discussed before.)
-roy
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Problems with interaction of SRS and Challenge/Response
