I have the following line in my /etc/postfix/main.cf
smtpd_milters=inet:127.0.0.1:8891 inet:127.0.0.1:8893
So then What should I put for Socket in /etc/default/opendkim or /etc/opendkim.conf ?
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user17130130
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If you want OpenDKIM to open a listening socket on port 8891, put the following in /etc/opendkim.conf.
Socket inet:8891@127.0.0.1
Postfix will then try to reach this milter using the smtpd_milters setting shown in your question.
Follow one of many, many online guides available for how to set up OpenDKIM. For example the quickstart in Debian wiki.
glts
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Why are there 2, 8891 and 8893? I'm supposed to define sockets for both in opendkim.conf ? – user17130130 Oct 23 '21 at 15:02
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Well don't put two ports then. Configure one in /etc/opendkim.conf and the same one in /etc/postfix/main.cf. – glts Oct 23 '21 at 15:06
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2Usually `opendmarc` uses `8893`. Did you install that, too? – Paul Oct 24 '21 at 13:32