sorry for the late response. Too much to do…
I use one e-mail address for each queue and then retrieve these mails via the settings in the queue. This works for me.
How does it look? How do you know it works?
Ist that really the correct Mail-Adress of your mail recipient?:
Can your system resolve the DNS name correctly?
Did you integrate the mailbox into your EGroupware?
(Is the server allowed as a client on Google?)