26 Sep 2025
It's possible to just list multiple domains in opendkim.conf
which will all get signed with the same key indicated by KeyFile
and Selector
(as pointed out here).
# Sign for example.com with key in /etc/dkimkeys/dkim.key using # selector 'mail' (e.g. mail._domainkey.example.com) # hacky, multiple domains, all share the same key and the same DNS setup # so we also need mail._domainkey.bla.net and mail._domainkey.blub.org DNS records Domain example.com, bla.net, blub.org KeyFile /etc/dkimkeys/example.com.key Selector mail
A more complex way with individual mappins is described here.
A good way to test the setup is appmaildev.com's DKIM Test.
posted at: 10:10 | path: /configuration | permanent link