Environment:Windows Server 2016 - Exchange Server 2016 CU15
On one shared mailbox, there is a issue, that when email is sent to it, users don't get that email.
Tested with Test-Mailflow Result, email do arrive at it's destination, but disappear after a second.
Restart of the exchange services solve issue, but I have also confirmed that if only Exchange Information Store service is restarted, it also works fine afterwards.
But only for some time.
I have checked with Get-InboxRule -Mailbox command on Exchange Management Shell, and mailbox has one rule which is correct, that is to delete email which come from specific address.
Mailbox is in correct database, as this is only database I have.
In Message Tracking Log I see that email is successfully delivered. There is no pointing to specific folder or something.
There is one redirect, but for this it is set up to forward mail to specific address, with option to deliver to both forwarding address and mailbox, enabled.
Any suggestions ?