over quota retention period does not work ?

i have configured iMS 5.2 to "keep and try" messages to "overquota" users for 30 days before returning them to the sender.

Currently testing, it appears the mails are returned 14 days instead of 30 after the initial delivery attempt.

Oddly, the first "delay" notification (1 day after) states that it "will continue to try delivering for 28 days"

however, the final returned status mail states that "Delivery has been manually aborted" and this usually at 00:30. As i am currently the only Postmaster, and am certainly not interested in staying up late just to bounce mails...

i wonder if there is some hidden procedure in iMS 5.2 which would itself bounce the messages ?

[716 byte] By [709035] at [2007-11-25 8:20:40]