Issue: 
Have incoming SSL running on port 465 /587 (SMTP secure) port, but would rather have SSL working on port 25 via TLS. 
 
Solution: 
1. Open up the server's configuration document. 
2. Follow the tabs: Router/SMTP --> Restrictions and Controls --> Advanced ... --> Commands and Exceptions 
3. Change the field, SSL negotiated over TCP/IP port, to Enabled. 
 
 
See IBM doc: 
https://www-304.ibm.com/support/docview.wss?uid=swg21108352 
  
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