
It's advisable upgrade FaxMaker to the latest version, which supports TLS. IIS SMTP component not available natively on Microsoft Windows 7, Microsoft Windows 8 and 8.1.Other configuration settings may be required depending on your environment, please confirm with your mail server administrator.Open outbound security and enable TLS encryption.Set it to forward all emails to the mail server.Set 'Allow incoming mail to be relayed for this remote domain'.Right-click the Domains icon > select New > select Domain.

Start > Administrative Tools > Internet Information Services (IIS) Manager.Change the domain used in the transmission reports to a domain that the mail server will accept.Create a TXT or CNAME record depending on the type of DKIM record provided to you. Navigate to the DNS records section for your individual domains. After you get your public key: Login to your DNS provider’s management console as the admin. To implement this solution, make sure TLS is enabled for IIS' SMTP server. Publishing your DKIM public key for GFI MailEssentials. If your FaxMaker version cannot be configured with TLS encryption it can submit the message to the local machine and let IIS route it to the server using TLS encryption.

Microsoft Office 365) require the use of TLS encryption.
