Tony,
It is possible that instead of relying on RMTA to record the SMTA IP address, we can do a DNS MX lookup of sender email address to get the MTA IP address at the sender side. However, this indeed means that if sender side uses different MTA servers for incoming and outgoing messages, they need to be in sync about state of outgoing message queue (for example, shared file systems).
Gee, that's a good idea. Imagine a shared filesystem supporting the whole email infrastructure for millions of customers!
Tony. -- f.a.n.finch <dot at dotat.at> http://dotat.at/ BISCAY: WEST 5 OR 6 BECOMING VARIABLE 3 OR 4. SHOWERS AT FIRST. MODERATE OR GOOD.
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