On 2023-09-24 06:16, Wietse Venema via Postfix-users wrote:
Stanislav via Postfix-users:
Greetings,

After upgrading from postfix 3.7.3 to postfix 3.8.2, I've noticed my
email is not signed with DKIM anymore. After further investigation, I've
found that Postfix ignores milter on outgoing emails (incoming goes
through milter ok).

This has not changed in Postfix, I suppose your configuration has changed.


Hi,

I've found the root cause. Sorry, it's pretty trivial.

While trying to generate a long-long answer with all the details to share with you guys, I've realized I have smtpd_milter_maps defined in my configuration.

It's been a while, but I guess my goal was to disable Milters for local clients to skip checks, aka "whitelist" everything local, but I completely missed that DKIM signing will be disabled too because of that change. Also, it looks like I modified the smtpd_milter_maps file, though I didn't restart/reload Postfix after the modification, so when I did upgrade, new configuration finally kicked in.

I appreciate your help!

Thank you

Best
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