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From: Wietse Venema (wietseporcupine.org)
Date: Tue Nov 13 2007 - 06:05:03 CST
> is it possible to forward ETRN request? I'm planning to add one or more
> machines to our backup MX for customers and do DNS balancing. Everything
> should work fine, except ETRN. Or does anybody use another solution?
Instead of having mail stuck in multiple queues, consider using a
fallback-relay host for this purpose, and have customers send their
ETRN commands there.
Internet -> MX1--\
Internet -> MX2---> fallback-relay --> customers
Internet -> MX3--/