I have my email address with the domain "toykick.com" (hereafter refereed to as toykick) that I have created a Google Apps account for and have set up email. For a few hours today, after DNS propogated, For some weird reason I was able to send emails out but could not receive any emails. I was using my personal gmail account "7tickets" to send emails to toykick.
After about an hour I decided to try other email accounts to test (not sure why it took me so long). I tested about 3 other accounts (2 gmails and 1 other domain) and they're perfect. They can send and receive email to and from my Toykick email just fine.
However, this one gmail account - "7tickets" - can't send emails to toykick. It just keeps getting bounceback messages. I would post email headers but am not sure how safe that is to do on a public facing forum?
However, I will include this if it helps:
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 relay not permitted (state 13).