A client had someone setup a domain and mail account for them on siteground.
The primary mail address is used on multiple installations of Outlook in their office. All installations are set to leave a copy of the mail on the server, however, most times everyone does not get a copy of all mails. Everyone gets mail at some point but not the same mail.
They have confirmed that there is no other installation and all are set to leave a copy on the server.
Any idea why this is happening?