I'm getting tons of spam to the email accounts setup up under my domain name. What tools can I use to reduce this spam? I'm looking for what I can do in addition to having captcha on my website's contact form. Any suggestions?
You could install Google Apps on your domain and take advantage of Google's spam filtering. The interface is much better than SqurrelMail as well IMO.
if you talking about getting emails on email ids which may not be even exists, so first thing you may want to do is disable default email id, which means you will not get flooded with emails which does not exists and you will receive emails only on your created ids
We did try Google's a few years ago and had problems with some messages not being delivered. For what ever reason that happened I've been hesitant to try it again.