Answer

SENDING

1. To send faxes using Microsoft Outlook, please review: How to setup GFI FaxMaker with hosted email solutions
2. To send faxes via the GFI FaxMaker Fax Message Form, install and configure the GFI FaxMaker Client following the article: How to send faxes through GFI FaxMaker using the client, with no Exchange in organization

RECEIVING

1. Login to the Office 365 Portal (http://portal.microsoftonline.com/)
2. Under the Management section, navigate to 'Domains'
3. Select the radio button next to your mail domain, then select 'Manage DNS'
4. Copy the 'Points to address' value which aligns to the Type MX row
5. In the GFI FaxMaker Configuration, select 'Email2FAXGateway', Properties
6. Under the 'SMTP connector' tab, in the Mail server name field, place the value from Step 4 above.  Port field can be configured with a value of 25
   • If desired, you may configure your Email2FAXGateway settings to Use SSL
7. ​Select to 'Send test email' to an email address of a user configured in the 'Licensed users' node of the GFI FaxMaker Configuration and ensure success in receipt

TROUBLESHOOTING: Mail rejected because your IP address is on a blocklist

When the SMTP Connector sends to Microsoft 365 on port 25 (the MX endpoint above, or a connector that trusts your public IP address), Microsoft 365 relies on the reputation of that IP address. If the IP address is listed on a blocklist, Send test email and FaxMaker's emails (received faxes, transmission reports and notifications) can be rejected with an error similar to:

550 5.7.1 Service unavailable, Client host [x.x.x.x] blocked using Spamhaus

• Removal from the list is handled with the list provider. The error message includes the provider's lookup link with the removal steps.
• To stop depending on the IP address's reputation, configure the SMTP Connector to sign in to Microsoft 365 with Office365 Authentication (OAuth 2.0) on smtp.office365.com port 587. See Recommended: Office365 Authentication (OAuth 2.0) in Setting up GFI FaxMaker with Microsoft Office 365 Enterprise Accounts.