Hi
We have few different sets of Postfix mailservers with different roles;
inbound servers, outbound servers that DKIM sign outgoing mail with a
milter, and some other servers that just relay mail that is already signed
elsewhere.
The first and third types of mailservers don't need to sign mail passing
through them, but we are looking for a way to sign their locally generated
mail (bounces or DSN's), preferably without having to setup and maintain
DKIM milters (and corresponding private keys) on all those servers.
Is there a way to make Postfix relay locally-generated mail to a specific
relayhost (one that DKIM signs outbound e-mail), without impacting regular
mail routing? Similar to non_smtpd_milters for locally generated mail?
(a sender_dependent_relayhost_maps override for empty senders won't do,
as such mail could come in via smtpd as well, and shouldn't be signed.)
Geert
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