Postgrey logs not landing in /var/log/mail.log on Ubuntu 22.10

[labrown]

I'm setting up a new personal email server running Ubuntu 22.10 and just implemented postgrey using the available Ubuntu package.

The logs emitted by postgrey are landing in /var/log/syslog, instead of /var/log/mail.log where I expect them to be.

These are the logs I see in /var/log/syslog when I sudo service postgrey start the daemon.

Feb 25 14:03:29 polar systemd[1]: Started Postfix greylisting policy server.
Feb 25 14:03:29 polar postgrey[45397]: 2023/02/25-14:03:29 postgrey (type Net::Server::Multiplex) starting! pid(45397)
Feb 25 14:03:29 polar postgrey[45397]: Resolved [localhost]:10023 to [::1]:10023, IPv6
Feb 25 14:03:29 polar postgrey[45397]: Resolved [localhost]:10023 to [127.0.0.1]:10023, IPv4
Feb 25 14:03:29 polar postgrey[45397]: Binding to TCP port 10023 on host ::1 with IPv6
Feb 25 14:03:29 polar postgrey[45397]: Binding to TCP port 10023 on host 127.0.0.1 with IPv4
Feb 25 14:03:29 polar postgrey[45397]: Setting gid to "999 999"
Feb 25 14:03:29 polar postgrey[45397]: Setting uid to "998"

I tried figuring out what's going on, but everything looks OK to me with my very rusty Perl skills. Not sure why the syslog_facility isn't being set on the syslog connection properly.