On 2021-05-17 at 19:02:10 UTC-0400 (Mon, 17 May 2021 18:02:10 -0500)
Nathan Dehnel <ncdeh...@gmail.com>
is rumored to have said:

I am setting up a new email server, and I am unable to connect to it with
Icedove, and postfix logs errors when I attempt to do so. I am using
postfix + dovecot + opendkim + spamassassin.

Systemd log:

[...]

May 17 15:29:50 gentooserver postfix/smtpd[119496]: connect from
unknown[10.0.0.103]
May 17 15:29:50 gentooserver postfix/submission/smtpd[119495]: connect from
unknown[10.0.0.103]
May 17 15:29:50 gentooserver postfix/smtpd[119496]: fatal: host/service
localhost/12301 not found: No such file or directory
May 17 15:29:50 gentooserver postfix/submission/smtpd[119495]: fatal:
host/service localhost/12301 not found: No such file or directory
May 17 15:29:50 gentooserver postfix/smtpd[119499]: connect from
unknown[10.0.0.103]
May 17 15:29:50 gentooserver postfix/submission/smtpd[119500]: connect from
unknown[10.0.0.103]
May 17 15:29:50 gentooserver postfix/smtpd[119499]: fatal: host/service
localhost/12301 not found: No such file or directory
[...]

postconf -n:
[...]
smtpd_milters = inet:localhost:12301

Whatever milter you are trying to use on port 12301 (possibly OpenDKIM?) is not running or something in your system config (e.g. iptables firewall) is blocking connections to it.

--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire

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