Exchange and webserver and Mikrotik

Hi!

I like the following:
I have a win2k3.

  • Active Directory
  • Exhange mail server
  • Web server (two websites)
    I have a Mikrotik connected to the Internet. I like to use the MT to the followings:
    mail.xyxy.com is the mail server from outside. I use a DSTNAT to forwrad the 25 port to the win2k server. Is this enough? (110 to POP3)
    An also I like to receive mail from mail.zzzzz.com. How to do this in Mikrotik?

Second: There is two website in the server:
website1.com and website2.com, how can I do this in the Miktorik? in the DNS the website1.com is my public IP address, bu how can I add to the Miktorik when somebody want to reach the website http://www.website1.com to forward to the win2k3 webserver?!

I use now ISA 2000 and there is possible to use like this.

Thanks in advice!