Hello, new to Linode here and my first post as well. I also wanted to say that I am very impressed with linode so far and its documentation.

I have a linode 512 running Ubuntu 12.10.

Now I know that I can change my nameservers on GoDaddy to point to my linode (which I have done) but of course this breaks my webmail.

Now GoDaddy says that the correct settings for my MX records are:
0 smtp.secureserver.net
10 mailstore1.secureserver.net

My question is: Is it sufficient for me to just add these two entries to my MX records, and also according to this post it seems that I would need trailing periods?

viewtopic.php?f=11&t=3141

Any help would be appreciated as I am still somewhat clueless on this.

Yep just add those records in the Linode DNS manager and you'll be fine. No need for trailing periods, the manager adds those for you.

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Cool, thanks for the quick reply.