Not to hijack this thread, but I came here today to report the same issue with the most recent version of SmarterMail. Override Auto Clean Settings when set to either Message Date or Time In Folder does not work as intended for the Deleted Items folder. My findings are as follows:
When Override Auto Clean Settings is enabled for a user and they set it to either Message Date or Time In Folder emails are deleted from the Deleted Items folder after approximately 7-8 days, even when the setting is set to a higher range such as 90, 1095, or 3650 days.
The settings.json for the user shows the following:
"auto_clean_override_active":true,
"auto_clean_rules":[{"id":3,"folder_name":"deleted items","type":1,"threshold_days":1095,"threshold_mb":10,"goal_mb":5},
{"id":4,"folder_name":"inbox","type":1,"threshold_days":3650,"threshold_mb":10,"goal_mb":5},
{"id":5,"folder_name":"sent items","type":1,"threshold_days":3650,"threshold_mb":10,"goal_mb":5}],
I have manually removed the following from each folder:
,"threshold_mb":10,"goal_mb":5
Time will tell if it resolves the issue or not. Should know for sure in a couple of days.