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Tools > Account Settings
Outgoing Server Add   Outgoing Server (SMTP) > [Add...]
SMTP Server   Settings
   Description: RealSender
   Server Name: rsxxx.realsender.com
   Port: 587

Security and Authentication
   Connection security: STARTTLS
   Authentication method: Normal password
   User Name: (the one we sent you)

[OK]
Outgoing Server (SMTP) Settings   RealSender > [Set Default]
Outgoing Server (SMTP)  

Account settings
(select you email account on the tree at the left side)

Outgoing Server (SMTP): RealSender

[OK]

thunderbird-send-mailserverpasswordrequired

The first time you send a message

Outgoing Server (SMTP) Password Required
Enter your password for...: (the one we sent you)
[x] Use Password Manager to remember this password

[OK]