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Level 10

In that case, I am not sure, but I think the e-mail which is invalid would be the sender's email, not the receiver's.

So my guess is, the email that you have provided is good. The email that your PDF is trying to send an e-mail with, is not logged in or cannot be accessed...

If this is not the problem I suggest you to make your custom submit email

By using the following code you can customize your submit button: