How to properly set up spamassassin as postfix's mail filter without
spamd?
reddit / selfhosted

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0xFFE · 2023-11-12 12:30

I have my personal mail server which receives 5-10 mail notifications
a day. I don't get any spam, but I want to set up SPF/DKIM validation
to prevent spoofing just in case. I know how to do this with
spamassassin, and there are a ton of instructions for spamc, but I
really don't want spamd running 24/7 and eating a good chunk of my 1G
RAM.

For now I ended up with piping emails to a script. In postfix's
master.cf:
   spamassassin unix -     n       n       -       5       pipe
       user=spamassassin argv=/usr/local/bin/spamfilter ${sender}
${recipient}

And the script contains a single line:
   cat | spamassassin | /usr/sbin/sendmail -oi -r "$1" "$2"

It works, but feels hacky. Is there a better way to do this?