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osx mail  
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osx mail - accounts - account information - edit smtp   Outgoing Mail Server (SMTP)
> Edit SMTP Server List ...
osx mail - smtp - account information  

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Account Information

Description: rsxxx.realsender.com
Server Name: rsxxx.realsender.com

TLS Certificate: None

osx mail - smtp - advanced   Advanced

[ ] Automatically detect and maintain account settings

Port: 587   [x] Use SSL

Authentication: Password
[ ] Allow insecure authentication

User name: (the one we sent you)
Password:  (the one we sent you)

[OK]
osx mail - accounts - account information Outgoing Mail Server (SMTP) > rsxxx.realsender.com

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