Flashster

Background:
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I am setting up (or will be soon) a colo w2k3 server mainly for hosting web sites I design for my clients (small businesses). The clients will only have 'write' access to the server by way of the content managment system I integrate with their web site.

I will only have 1-2u of space (i.e. 1 server which I've yet to build), 1 power socket, and a small number of IP addresses. I am familiar with w2k server, but have yet to get my hands on w2k3, hence some of my questions below.

I think it would be useful to be able to a limited number of pop mail accounts with my web offering - say 10-15 pop addresses per domain.

My questions are:
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1) Has w2k3 got any built-in functionality for handling mail, or is this not technically possible/advised?

2) What POP/SMTP mail servers do you recommend? (I don't think a web interface is absolutely necessary for the mail - besides I don't want the client storing all the mail on the server - rather it was all downloaded) MailEnable Standard and Hmail have already been suggested and I've yet to look at them.

3) Is it ok to have the POP/SMTP mail running on the same server and the web sites?

4) Do I need to consider IP addresses when it comes to the mail, or is it like the web side of things in that I can set up virtual domains under the one IP.

5) What about blacklisting of mail servers - is this something I need to consider and if so how would you guard against it?

6) Do I need an integrated anti-virus solution if running a mail service such as this?

7) How do you deal with disk quotas on Windows 2003 regarding mail (if I were opting for a web mail feature for example)?

8) *Should I forget all this and use a free/cheap third party mail service? If so who do you use?*

Thanks - sorry for all the questions but I've been up all night thinking about this.....

Flash