Where to go from SMTP Mail Security? Help needed

Hi Guys,

I think SMTP Mail Security and Endpoint Security are the two best Symantec products I've used. Shame one of them has reached end of life :/

We've been using Symantec SMTP Mail Security to filter many of our customers email. By using local domains we've been filtering about 30 customers email domains. I understand this was not intended. Ignoring that, is there a Symantec replacement for this sort of product? We need to be able to filter many domains. Each domain is being forwarded to a specific mail server.

If Symantec doesn't have a product (I don't want to resell their hosted product), is there anyone else (maybe Ironport?).

Help is needed as a bit of planning and research is required.

Thanks