Force all SMTP outbound emails to use TLS only


SUMMARY

You may need to configure the mail server to only send outbound email using TLS.

DETAIL

In order to force outbound TLS on all emails sent from the server, you will need to enable the registry key below as described below:

  1. Open Microsoft Windows "regedit".
  2. Navigate to the following MailEnable registry branch:

    32bit Windows: HKEY_LOCAL_MACHINE\SOFTWARE\Mail Enable\Mail Enable\Connectors\SMTP

    64bit Windows: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Mail Enable\Mail Enable\Connectors\SMTP

  3. Create a new DWORD key named: No TLS fallback
  4. Set the decimal value to: 1
  5. Close "regedit"
  6. Restart the SMTP connector


    Product:MailEnable
    Article:ME020704
    Module:General
    Keywords:
    Class:HOWTO: Product Instructions
    Revised:Wednesday, July 31, 2019
    Author:
    Publisher:MailEnable