I have GoDaddy.com VPS server hosted there with 15 to 20 domains as well as hosting there. I also have Horde Email software (came with GoDaddy.com package) to use as web email to allow my end user to login checking email.
The server also using as SMTP server. I am actually thinking to use another SMTP server to handle email for the website.
And recently, our customer's emails getting more spam email coming in. And I just want to know what I can do to stop them.