I was wondering if there's anything special that needs to be done to get spamassassin and/or clamav to work with sentora's email system before I go installing (and potentially breaking) anything?
nothing special but you need to have enough RAM for that and take care for notre breaking postfix.
M B
Thanks, M B. I asked the company I rent my VPS from about it and they said it should be fine to add spamassassin with my current setup but ClamAV would be a bit too much. So I've done that. I would need to purchase a VPS with more ram to get ClamAV to run without stalling.
For future reference, I followed the (albeit a bit old) instructions at
DigitalOcean to install spamassassin, adjusting key pieces to match Ubuntu 14.04 LTS and current installation scripts.