welcome e-mail settings
I found the welcome e-mail settings in the language files. (mail_user.lng) It would be great to ispconfig have an option in the system settings for at least this two params: Welcome e-mail sender name, welcome e-mail sender address (and the welcome message text and subject too, imho)
Now this params are in the mail_user.lng file as this text variables: welcome_mail_fromname_txt welcome_mail_fromemail_txt welcome_mail_subject welcome_mail_message
Another problem is around with the encoding, because English language is okay, but languages like hungarian, czech and many more has special characters, and some of clients trims the subject and the body too near a special character. It is most desirable to change the welcome e-mail encoding to utf-8.