nomad

[email protected]

You are talking about reputation management which is not as big a deal as you might think.

Email is a simple system but there are a lot of things at work to prevent (more like reduce) spam.

Some DNS knowledge and some friendly emails to a few abuse @ addresses and a few months of quiet reputation building and you are set.

Add a few weeks of rspamd training and you won’t see much spam either.

SoGo server, comes with webmail, web calendar, tasks and contacts all sync able via DAVx5. I actually sell these to customers as I get these kinds of requests more and more often.