Overview

When testing the connection from the Email2FaxGateway configuration, the message "TLS 1.0 and 1.1 are not supported. Please upgrade/update your client to support TLS 1.2" is returned.

You may have already upgraded to the latest FaxMaker 20.4 build but the issue persists.

Solution

Microsoft has dropped support for older TLS versions, and connections to Office 365 now require TLS 1.2.

Support to TLS1.2 in FaxMaker is to be added in version 20.5 (not yet released at the time of this writing), but a workaround is available:

1. In FaxMaker Configuration > Email2FaxGateway, configure smtp-legacy.office365.com instead of smtp.office365.com in the Mail server name or IP address as stated in the article about Setting up GFI FaxMaker with Microsoft Office 365 Enterprise Accounts.
2. Ensure that the send connector has the "Always use Transport Layer Security (TLS) to secure the connection (recommended)" option enabled.
3. In Exchange Online PowerShell, confirm the value $true is set for the AllowLegacyTLSClients parameter on the Set-TransportConfig cmdlet. Check Microsoft's article Opt in to the Exchange Online endpoint for legacy TLS clients using SMTP AUTH for more information.

If you are still facing issues, you can use IIS to route the faxes to Office365 by following the article Using IIS to route messages to a mail server that requires TLS encryption.