I noted the following on the SPF site:
"In either case an MTA should reject messages from null senders that have more than one recipient."
Imail only allows to either permit or deny null senders. But, the above statement sounds obvious - an automated bounce message would be directed to the ONE and only sender.
Is this something worthwhile to test on?
This is a tricky one. While the RFCs do not specify any reason for an E-mail with a null sender to have multiple recipients, the RFCs do not say that it is not allowed. Therefore, doing so can technically break RFC compliance.
I just checked some spam we have here, and out of over 10,000 spams, it looks like only 1 used a null sender. So while this might make for an interesting test, it probably would not catch much spam.
-Scott
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