Gravity Forms doesn’t support using third-party email services for login in. As far as I know there are no third-party add-ons for it either.
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Hi Pedro. It sounds like you are trying to give the user a quick way to get to their email inbox, after the form is submitted. Is that correct?
If so, you can put the button link to the email login page in your confirmation message. You could create a single confirmation message and use the conditional shortcode to say “if the email address contains gmail.com then show this button”. You would need to know the links to all the common email service’s login page. But once you have that, you could put all those links into one confirmation, and show the correct one based on the domain the email address is from.
Here is the documentation for the conditional shortcode:
Your message text in the confirmation would look something like this (repeated for each mail provider):