On Mon, Jun 12, 2023 at 08:47:10AM +0000, wesley--- via Postfix-users wrote:
> may I know that, what's the mechanism for postfix to stop mail
> delivery looping?
>
> for example, u...@foo.com forwards to u...@bar.com, and u...@bar.com forwards
> back to u...@foo.com, this will be a loop.
>
> so how postfix find and stop this behavior?
By limiting the "hop count" (count of Received headers) and by checking
"Delivered-To:" headers added as part of indirect (aliases, ...)
local(8) delivery.
--
Viktor.
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