I use a contact form on my site. When the user utilize it, it sends an email-message to me and a confirmation mail to the user. BUT! Now I got this message from my web provider:

"This is the mail system at Simply.com (localsmtp.web.simply.com). Your message could not be delivered to one or more recipients. *YOU SHOULD BE SENDING MAIL USING WEBSMTP.SIMPLY.COM INSTEAD*"

I cannot find a way to specify a SMTP-server in Website x5. So how do I do?