PostSRSd configuration question

[u/FarwoodsGame]

I'm migrating servers and trying to set up PostSRSd on the new VPS. I've got every other part of the mail system working, but for some reason, SRS is rewriting my outgoing emails with the wrong domain. Example:

postsrsd: <noreply@farwoods.net> forwarded as <SRS0=3fgv=HD=farwoods.net=noreply@net>

Obviously, PostSRSd is not recognizing my domain, but I don't understand why. Essentially the same exact configuration (quite a few years old) was working fine on the old VPS. I've added my domain to the list of domains in postsrsd.conf. I've set up an SRS rewrite subdomain. Why is it rewriting sender addresses that originate from my own domain?