Majordomo configuration

"Luciano" <[email protected]>
Newsgroups gmane.mail.majordomo.general
Message-ID <[email protected]> 
I have opened a newsletter through our provider which exploits Majordomo.
I have to modify the welcome message that arrives to a new member, by replacing the message of default.
I have just sent the message of "intro" using "newintro newsletter" and the other message of "info" making use of "newinfo newsletter", and then with the appropriate controls i have ckecked (controllare)  that my messages had been changed.
Although this, a new member receive a welcome message with the messagge of default in addition to my message "intro".
 
How can I avoid the message of default?
thank you for the attention
Luciano
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