Does anyone know how to customize the "Welcome" email? I want to insert HTML to place the company image.
Copy /usr/local/ispconfig/server/conf/mail/welcome_email_en.txt (or whatever languages you wish) to /usr/local/ispconfig/server/conf-custom/mail/welcome_email_en.txt and make your changes there. I don't know that there is any way to send html; you could try adding the relevant headers (content-type and content-transfer-encoding?) and see if it works.
You must give us a least a chance to help you. How do you think someone can help when your problem is "Did not work". What have you done, what happened (error messages, log entries?), what would you expect ...
Sorry Jesse, the welcome email I want to change would be when I register the user at the ISP. I just want to insert my company's logo using html in the email. The email is sent but it does not interpret the HTML. I just changed the text in the language file
Do you mind sharing your changes and what email was sent (sourcecode)? I would suggest to write an email like you want to have it in your mail program. Save it as a draft, look at the sourcecode and use this as an example.