I'm not sure if it is my SME 7.0 server responible for this, but ever since I upgraded to 7.0 I've me have mail delivery problems. Just note I don't use my SME 7.0 for email, so I'm not sure what the problem is. Below is email failure log. If there is more info need to help with the diaginosis let me know.
6 0.68 CNAME lookup failed temporarily. (#4.4.3)/I'm not going to try again; this message has been in the queue too long./
1 20.01 Sorry, I couldn't find any host by that name. (#4.1.2)/I'm not going to try again; this message has been in the queue too long./
1 0.66 Sorry, I couldn't find any host named bbox. (#5.1.2)/
18 3.46 Sorry, I couldn't find any host named gbox. (#5.1.2)/
58 20.44 Sorry, I couldn't find any host named geeko-box.geeko-box. (#5.1.2)/
20 2.08 Sorry, I couldn't find any host named geekobox.geekobox. (#5.1.2)/
72 10154.03 Sorry, I wasn't able to establish an SMTP connection. (#4.4.1)/I'm not going to try again; this message has been in the queue too long./