Due to the new spam filtering recently installed in the Email system - it can take a few hours for 'Untrusted" emails to arrive in your mail box. Untrusted simply means from domains that have not been cleared by you in advance. You will get them but the time delay can be annoying. To get around this for friendly email you need to customize your Spam Filtering in your Smarter Mail settings:
Go to: http:mail.yourdomainname.com or http://webmail.yourdomainname.com:9998 (the first one is our shared server and the second is our dedicated server) and log in.
That's it. Now test a few emails to see if it works.