TL;DR: I want to pull emails from 5 accounts on to my homeserver to anti spam them and have my clients pull from there

I currently have like 5 major email accounts on different providers which I use for 100s of accounts on many platforms.

Some of these accounts are very old and come with the added bonus of no spam filter on the free tier.

Now, if you use outlook, you can define anti spam rules there, I know. But since I‘m using many different devices and different mail clients, I can’t be bothered to make anti spam rules for all of them.

So I thought it should be doable to pull all the emails from all my accounts and have them go through anti spam on my home server. Sidenote: I have anti spam on some email providers but I can’t redirect the one address to there as to use that accounts anti spam.

One solution would be to just get rid of this one account but I‘m a little anxious about the consequences since it is my oldest account with unthinkable amounts of accounts linked to it.

Does anyone have a similar scenario or an idea for a solution?