Hi,
First of all, could you tell us why? If its because of 0-day-exploits, ok. Otherwise dont quarantine these mails, just use exceptions.
I havent tried jet but, take a look at the custom option of the expunger in quarantine settings. Sounds like at least after x days the custom action is applied and there it might be possible to deliver normally.
If this does not work or does not meet your requirements, depending on you infrastructure behind smg you could
- (in case of exchange) configure a new receive connector with certain tarpit time or eq throttling policy, dont use quarantine for domain abc, and deliver directly.
- (sendmail etc) drop your mails in a queue directory and cron a script to pickup these mails.
Hope it helps
Thomas