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Is it possible to have a signup form for a service directly inside an HTML email, with textboxes and buttons the user can submit?
How would this be done?
2nd question: is it possible to automatically redirect to a webpage when a user opens an email? (so the signup page can be on a separate page)
You can have a html form in a email and set the form action to post to your website url. You could also load a website page into a div or other tag with javascript. The problem with these approaches is more and more email clients and anti virus programs will block the url's or bin the email.
Email clients generally do block such actions which is why it's usually best to get the user to go to a page containing the form. You can have some of the details on the form filled out, such as email address and name.