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Mail Setup > [E-mail Accounts...]

 
[Change...]

 
Outgoing mail server (SMTP): rsxxx-realsender.com

[More Settings...]

 
Outgoing Server

[x] My outgoing server (SMTP) requires authentication

[x] Log on using
     User Name: (the one we sent you)
     Password: (the one we sent you)
     [x] Remember password

[OK]
Advanced

Use the following type of encrypted connection: TLS

[OK]