Sébastien Kiss Marton

Sorry,

The sender email adress does not depend to this plugin.

I found the solution : https://www.webanddesigners.com/change-wordpress-default-mail-sender/

I solved my problem by changing the name of the FTP directory.
wp-content/plugins/welcome-email-editor/ -> wp-content/plugins/-welcome-email-editor/

It does not work for me either whit WordPress 3.6.1 . It is always the original email that is sent.