We are very happy with Virtualmin. Been running quite a few servers over a few years. We are having no problems with actual email delivery.
The only main issue we keep facing is the amount of spam that make it to users’ inboxes.
I’m using an older server as an example here (see specs below). Sure, lots of spam gets trapped in the spam folder - but about 30% (at a minimum) of messages that make it to inboxes are spam or phishing messages.
I have already (over the years) built up a plethora of custom header, subject and body checks for the server’s Spamassassin instance. I also have some entries for allowed and denied addresses, etc.
I just feel like I’m missing a “best-use-case” scenario - I can’t see how most sysadmins will be contempt with this amount of spam in their users’ inboxes. (We do receive quite a few complaints form users.)
So, I have a few questions, and I’d be very thankful if some of you could weigh in on this matter:
Is the only viable solution, to successfully running your own mail servers, to make use of a paid SaaS or cloud email scanning service?
What anti-spam route do you take for your typical Virtualmin (or Virtualmin Pro) server installations?
Would you mind pointing me towards a resource or examples/use-cases of how our systems can be configured, adjusted or improved in this regard, based on your current anti-spam solution?
Thank you for your time and for reading this far!
|OS type and version||Ubuntu Linux 18.04.6|