Multiple domains and DynDNS

[ScottChapman]

I want to host a single server to host email account for several domains.

The server is going to be running onmy home network behind a firewall where incoming port 25 is being blocked by the ISP.

And I don't have a static IP.

I am considering using DynDNS to solve the static IP and SMTP port relay issue (using their MailHop feature).

My question is, does anyone else do this? Are you able to route the other domain's MX records through a single DynDNS account?

[uxbod]

By the looks of things you will need to setup Mailhop relay for each of those domains aswell as your own. The only other way I see of doing it is by using a combination of their Custom DNS and Mailhop Relay services. I would advice to send them a email and explain what you are attempting to achieve, and see what they would recommend. I use them myself for secondary DNS and MX never had any problems with them.

[ScottChapman]

It turns out that it is cheaper for me to get a business class service (which opens up port 25) than it is to pay for mailhop service.

So, my next question is abolut DNS and stitching this together...

I have my Dynamic DNS account, which works like a champ. I can get to myserver at <dyndnsaccount>.com:80

So, I created a CNAME record which had:
zimbra.<mydomain>.com -> <dyndnsaccount>.com

However, zimbra.<mydomain>.com:80 doesn't appear to work.

Any ideas?