I have several people that check their email accounts online via the web. I have this http://omusicstudios.com/webmail
hosted on bluehost.com. It's automatically created and have different options of GUI email functionality between Horde and others.
The workers are complaining about spam. I know bluehost has their google postini anti-spam but I don't wish to pay for it. I was thinking that perhaps I can route my email through some intermediary email servers (Centos Linux) that I can set up from the office which will have something like SpamAssassin on it. I was thinking I can route these emails through this filtering process and then forward to the appropriate email accounts.
Is this even possible? If so, where would I start? I can set up the email servers on a Centos system.
Any help or suggestions is appreciated. =)