Mail server not accessable via port 25, 587

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Netid     State      Recv-Q     Send-Q         Local Address:Port           Peer Address:Port     Process
tcp       LISTEN     0          20                 127.0.0.1:25                  0.0.0.0:*         users:(("exim4",pid=1219,fd=4))
tcp       LISTEN     0          20                     [::1]:25                     [::]:*         users:(("exim4",pid=1219,fd=5))

exim4 - it even has a service

# systemctl status exim4
● exim4.service - LSB: exim Mail Transport Agent
     Loaded: loaded (/etc/init.d/exim4; generated)
     Active: active (running) since Mon 2024-04-29 15:34:20 NZST; 4h 43min ago
       Docs: man:systemd-sysv-generator(8)
    Process: 845 ExecStart=/etc/init.d/exim4 start (code=exited, status=0/SUCCESS)
      Tasks: 1 (limit: 17813)
     Memory: 16.0M
        CPU: 1.305s
     CGroup: /system.slice/exim4.service
             └─1219 /usr/sbin/exim4 -bd -q30m

Stopped exim4 and masked it out, and it looks like I can move forward.

Must have been installed during the initial Debian install.

Thanks

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