Email notification admin + user

[Joachim Müller]

There's no such thing as sendmail on Windows. As suggested above: if you have little clue how to operate a webserver of your own, you shouldn't run one. This definitely is not the proper forum to learn how to operate one anyway. If the domain you're hosting on your webserver is yours to administer, you should create an email address of that particular domain and use it for sending emails using SMTP. However: this is not Coppermine-related. Coppermine expects that your server is properly configured to send emails. Yours isn't. Fix this first, then come back here if you still need support.