JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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That is because your email address has been added to our bounce list.
email@example.com is IN the bounce list
smtp;550 Message rejected
I've fixed this for you, but to prevent this from happening again, you should do our recommendations from the following guide.
Whitelisting us is one of the important steps so you should do. The guide also explains how you can remove your email address to our bounce list.