When using Email Archiver with Microsoft Office 365 mailbox, read receipts are sent out by the mailbox when emails are removed from this mailbox and archived by Email Archiver cleaning mailbox procedure. The removal process generates an error saying emails were deleted without being read, regardless of whether the intended recipient of the email read it or not. The following steps will help you to prevent this issue:
- Log in into Microsoft Office 365 using the journal mailbox user account.
- Go to Outlook tab
- Select Settings icon then click Options.
- Click Settings.
- Under read receipts, select Never send a response.
- Click save.