On 18.11.21 17:10, Togan Muftuoglu wrote:
Should Sender Rewriting Scheme be enabled for a server acting as backup MX.

no, SRS is supposed to be implemented for outgoing. not incoming mail.

My understanding is SRS is needed if the mail server acts as forwarder. But
in the case of a backup MX it is not a forwarder. (or is it ?)

is it not. To be precise:

SRS is to be used when you accept mail for one address and re-send to
another address (in different domain/on different server).

this is not the case for backup MX.

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