Re: [exim] Callouts, NULL DSN

On Mon, 22 Aug 2005, Steve Brown wrote:

> Okay, so why would one ever do a sender callout rather than just *always*
> doing a header_sender callout?

A return-path callout gives you some confidence that a message can be
bounced, and therefore greatly reduces the number of double bounces you
must deal with.

Tony.
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