Server Authentication
On the LibreOffice - PreferencesTools - Options - LibreOffice Writer - Mail Merge E-mail tab page, click the Server Authentication button to specify the server security settings.
The outgoing mail server (SMTP) requires authentication
Enables the authentication that is required to send e-mail by SMTP.
The outgoing mail server (SMTP) requires separate authentication
Select if your SMTP server requires a user name and password.
User name
Enter the user name for the SMTP server.
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Enter the password for the user name.
The outgoing mail server uses the same authentication as the incoming mail server.
Select if you are required to first read your e-mail before you can send e-mail. This method is also called "SMTP after POP3".
Server name
Enter the server name of your POP 3 or IMAP mail server.
Port
Enter the port on the POP3 or IMAP server.
POP 3
Specifies that the incoming mail server uses POP 3.
IMAP
Specifies that the incoming mail server uses IMAP.
User name
Enter the user name for the IMAP server.
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Enter the password.