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Exchange 2016 - Email data automatically gets Deleted

Anthony K O365
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In our Exchange 2016 On-prem environment, we have a few users where their mailbox data just gets deleted but bypasses the Deleted Items folder and goes right into the Recoverable Items folder. There is no automated Outlook or Transport rule in place nor is there automate processing going on.  Has anyone seen this?
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AlexA lack of information provides a lack of a decent solution.

Commented:

When you say their mailbox data gets deleted, do you mean out of AD, the mailbox itself is removed or the content of the mailbox?


Thanks

Alex

Saif ShaikhServer engineer

Commented:
Check the "keep deleted items retention" days i.e. default 14 days on the mailbox database properties in EAC.

If it is zero then it might purge all items instead of moving them to deleted items.
Anthony K O365Messaging Consulting

Author

Commented:
Alex - It's just some of the email data in their mailbox, not the mailbox itself or AD data.

Saif - The retention time is set the default database setting of 14 days, All users have the same setting, But some users data is getting deleted.

 I'm currently checking Junk E-mail Filter settings, 3rd party Virus scanners, 'Ignore Conversation' in Outlook, and seeing if these users are using any smartphones or tablets

Jason - Audit logging is disabled for all user mailboxes at this time.

Commented:

The best way to narrow down whatever mechanism is responsible going forward is to enable audit logging. 

Anthony K O365Messaging Consulting

Author

Commented:
sounds good. Thanks Jason!
Daryl GawnSenior Infrastructure Engineer

Commented:
have seen this happen sometimes when using a mobile to sync emails. If the affected mailboxes have mobiles syncing email , check the settings in whatever mail app they are using for settings to do with deleting emails or try remove the mail sync and see if the problem goes away

Commented:

Daryl - good call you're right especially with 3rd party email apps or Apple Mail.  This was especially bad back in the Blackberry days.

Messaging Consulting
Commented:
Gentlemen,

Here is the fix for me: Some users are using Outlook 2010 in the their Junk Email setting, they had a check box that says "permanently move certain items into Recover Deleted Items folder"  (or something to that affect) So certain items were getting removed from the Inbox and bypassing the Deleted Items folder. Once unchecked, the suspect email arrived in the Inbox.
Anthony K O365Messaging Consulting

Author

Commented:
Your help was truly appreciated!!