I configured the iPhone to sync all the e-mails (no limitation), but i still get only the mails from the past 3 days.

in the initial-sync-procedure we can read:
Now, if you set your device to get more than 3 days of mail, or a longer calendar range, it will kick off another sync to go get everything you've requested.
but when i set this setting to unlimited, i can't see a new sync starting in the web-management-utility of DataSync. (the initial sync completed successfully)

Any ideas how to change this limitation?
--> i am using the iPhone and have no other Device to test if the problem is iPhone-dependent.