Due to the architecture of Exchange servers, the emails sent internally (within your organization) are not filtered for spam. If messages from internal senders end up in Junk folder it might be caused by the following local reasons:

Outlook Junk Filtering

We do recommend having it OFF, as it may move emails to the Junk folder without any reason. In Outlook desktop app navigate to Home > Junk > Junk E-mail Options > Options > set to No Automatic Filtering.

Junk Rule Win

Outlook 2011 on Mac: Home > Junk > Junk Email Protection > Level > set to None.

Junk Rule Mac

Outlook Plugin 

Check your active plugins in Outlook > File > Options > Add-ins > Go > uncheck any antivirus plugins user has there.


Outlook Block List 

Check whether your company's domain/sender email address is added to Blocked list in Outlook 2010/2013 > Home > Junk > Junk E-mail Options > Blocked Senders.

Outlook Block Win

Outlook 2011 for MacHome > Junk > Junk Email Protection > Blocked Senders (note: to remove the entry from the list Junk filtering should be ON).



OWA 2013: Gear icon is right upper corner > Options > block or allow


OWA 2016/2019: Gear icon is right upper corner > Options > Mail > Accounts > block or allow


 Outlook Rules

Check whether the user has any rules in Outlook which may move emails to Junk. In Outlook > Home > Rules > Manage Rules and Alerts.BlockOWA


Outlook 2011: Home > Rules > Edit Rules > Exchange. OWA: Options > Organize email > Inbox Rules.

Note: if you use SMTP devices to send messages on behalf of your mailboxes (scanners, copiers, web-forms, etc...), those emails are not considered internal, and flow usual path through mail filters. One of the reasons why those emails may end up in the Junk folder is failed SPF record validation. To prevent this from happening add the device's IP address to the SPF record.