We just discovered that we have several hundred contacts whose email addresses have been set to on-hold bounce due to Away responses. Apparently the 3 bounce maximum is also being applies to emails with Away responses. How do we change this? Also, is there a time maximum interval for the 3 bounces, after which old bounce history is discarded? Thanks for any light that can be shed on this.
You can change the hold_threshold in civicrm_mailing_bounce_type table for Away to your own choice. By default it is set to 30. Not sure why your system is set to 3.
I dont think if there is any way to discard old bounces unless you delete from civicrm_mailing_event_bounce table. Probably good idea to write a script that runs on cron job to delete the entries of certain bounce type and X days old.