@killmasta93: please open a new thread (it's a different issue) - and post the journal, around the time this happens (+/-1 hour) - e.g. `journalctl --since 2018-02-21` (redact and remove e-mail addresses)
Feb 25 23:56:18 mail systemd[1]: Starting OpenDMARC Milter...
Feb 25 23:56:18 mail systemd[1]: opendmarc.service: PID file /var/run/opendmarc/opendmarc.pid not readable (yet?) after start: No such file or directory
Feb 25 23:56:18 mail opendmarc[1833]: OpenDMARC Filter v1.3.2 starting ()
Feb 25 23:56:18 mail opendmarc[1833]: additional trusted authentication services: (none)
Feb 25 23:56:18 mail systemd[1]: Started OpenDMARC Milter.
-- Logs begin at Tue 2019-02-26 12:41:55 -05, end at Tue 2019-02-26 12:57:14 -05. --
Feb 26 12:41:55 mail systemd[1]: Starting OpenDMARC Milter...
Feb 26 12:41:56 mail systemd[1]: opendmarc.service: PID file /var/run/opendmarc/opendmarc.pid not readable (yet?) after start: No such file or directory
Feb 26 12:41:56 mail systemd[1]: Started OpenDMARC Milter.
Feb 26 12:41:56 mail opendmarc[810]: OpenDMARC Filter v1.3.2 starting ()
Feb 26 12:41:56 mail opendmarc[810]: additional trusted authentication services: (none)
root@mail:~# ls -l -h /var/run/opendmarc/opendmarc.pid
-rw-rw---- 1 opendmarc opendmarc 4 Feb 26 12:41 /var/run/opendmarc/opendmarc.pid
submission inet n - - - 100 smtpd
-o content_filter=scan:127.0.0.1:10023
-o smtpd_enforce_tls=yes
-o smtpd_sasl_auth_enable=yes
-o smtpd_client_restrictions=permit_sasl_authenticated,reject
-o smtpd_recipient_restrictions=reject_unknown_recipient_domain
-o smtpd_sender_restrictions=
-o smtpd_helo_restrictions=
-o smtpd_milters=unix:/var/run/opendkim/signer.sock
smtps inet n - - - 100 smtpd
-o content_filter=scan:127.0.0.1:10023
-o smtpd_tls_wrappermode=yes
-o smtpd_sasl_auth_enable=yes
-o smtpd_client_restrictions=permit_sasl_authenticated,reject
-o smtpd_recipient_restrictions=reject_unknown_recipient_domain
-o smtpd_sender_restrictions=
-o smtpd_helo_restrictions=
-o smtpd_milters=unix:/var/run/opendkim/signer.sock
Feb 26 13:25:26 mail postfix/smtpd[2816]: BD9D5C09FA: client=verifier.port25.com[34.209.113.130]
Feb 26 13:25:27 mail postfix/cleanup[2808]: BD9D5C09FA: message-id=<1551205523-240926@verifier.port25.com>
Feb 26 13:25:27 mail opendkim[700]: BD9D5C09FA: verifier.port25.com [34.209.113.130] not internal
Feb 26 13:25:27 mail opendkim[700]: BD9D5C09FA: not authenticated
Feb 26 13:25:27 mail opendkim[700]: BD9D5C09FA: signature=VgFT16xR domain=port25.com selector=verifier201208 result="no signature error"
Feb 26 13:25:27 mail opendkim[700]: BD9D5C09FA: DKIM verification successful
Feb 26 13:25:27 mail opendkim[700]: BD9D5C09FA: s=verifier201208 d=port25.com SSL
Feb 26 13:25:27 mail opendmarc[810]: implicit authentication service: mail.mydomain.com
Feb 26 13:25:27 mail opendmarc[810]: BD9D5C09FA: verifier.port25.com none
#submission inet n - - - 100 smtpd
#-o content_filter=scan:127.0.0.1:10023
#-o smtpd_enforce_tls=yes
#-o smtpd_sasl_auth_enable=yes
#-o smtpd_client_restrictions=permit_sasl_authenticated,reject
#-o smtpd_recipient_restrictions=reject_unknown_recipient_domain
#-o smtpd_sender_restrictions=
#-o smtpd_helo_restrictions=
#-o smtpd_milters=unix:/var/run/opendkim/signer.sock
#smtps inet n - - - 100 smtpd
#-o content_filter=scan:127.0.0.1:10023
#-o smtpd_tls_wrappermode=yes
#-o smtpd_sasl_auth_enable=yes
#-o smtpd_client_restrictions=permit_sasl_authenticated,reject
#-o smtpd_recipient_restrictions=reject_unknown_recipient_domain
#-o smtpd_sender_restrictions=
#-o smtpd_helo_restrictions=
#-o smtpd_milters=unix:/var/run/opendkim/signer.sock