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To run mailhog server on startup, add mailhog_enable="YES" to /etc/rc.conf.

The SMTP server listens to 127.0.0.1:1025 by default while the web UI can
be reached at http://127.0.0.1:8025/

To change this look at the rc.conf variables in %%PREFIX%%/etc/rc.d/mailhog.
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