Google is reporting that they are investigating reports of mail delivery delay/issues for domains with the MX records being hosted on GoDaddy. Google is working with GoDaddy to get this resolved as soon as possible.
Steps to Reproduce:
1 - Make sure that the authoritative server for the affected domain is either ns29.domaincontrol.com or ns30.domaincontrol.com.
2 - Send an email message to that domain
3 - Notice that message delivery is delayed
Updates on available information is being released at the Google Enterprise Support Center - Known Issues
UPDATE 2:27 pm EST: Google has reported that the issue should now be resolved. Please let us know if you are still seeing this issue.