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Recommendations for inbound spam filtering
Looking for cloud-based inbound spam filtering for about 5 users on 1 domain. It needs to rewrite subjects/headers so our backend mail server can move the mail into its own spam folder (e.g. SpamHero has its own quarantine so users need a second login which is a PITA). Ideally less than $30/month with no contract. Don't need outbound filtering. Recommendations?

Comments
If you want something simple and affordable, MX Guarddog is the easiest and cheapest option.
Could also look into deploying a proxmox mail gateway. ( https://proxmox.com/de/produkte/proxmox-mail-gateway/uebersicht ).
Mailchannels inbound?
I think MailAssure is a few dollars a month. SpamExperts is similarly cheap.
The CERN one is free. Never tried due to prejudice.
I'm pretty sure there are resellers of Mailchannels inbound filtering, offering it for an affordable price.
Can't think of the names though, from memory I can only tell that Naranja resells outbound.
SpamExperts is also a great option, but I'm not sure what their pricing is.