ICal Server invitations not working through Google Apps

Question

Running Lion Server 10.7.4 – I enable the option to use email addresses for invitations, key in the Gmail user and server settings (same info that works in Mail), and save. Afterward, invite tests that users send do not go to the designated email address. The logs have this repeated error:
2012-07-09 14:24:03-0500 [-] [caldav-0]  [PooledMemCacheProtocol,client] [twistedcaldav.scheduling.scheduler.ScheduleResponseQueue#error] Error during POST for mailto:[email protected]: iMIP request failed
Italicized letters is a paraphrase of the actual email, any standard "[email protected]" type address gets the same failure.
I tried all the various authentication types: Plain, Login, CRAM-MD5, etc... tho it reverts itself to 'Login' after every save, I think the wizard tries the different authentication options and 'Login' is the one that works.

Answer 1

https://discussions.apple.com/message/17319571#17319571
instead of verifying email addresses associated with your appleID, try removing them.
I've read some of similar thread just now, and remove the associated email withing my apple ID
now, my friend can send invites to me ([email protected]) and i can reply within the ical and the event is created in the ical.
however, when she tried to send invites to my 2nd appleID (yahoo.com) i don't get anything.
I know this sounds very stupid. but at least i've got a temporary solutions.
hope this also works for you.
perhaps apple just us to use every service they've offer. there's too many ridiculous way to work in iCloud.
sometime i regret migrate to icloud. MobileMe was MUCH MUCH better in sync-ing