Emails: Limited notfication recipients

I can't seem to reply to gmail addresses to forms submitted.  I noticed a problem with gmail when I set up the form initially.  I tested sending it to several email address.  All we ok except for gmail.  Finally it worked, but I never figured out why it had not previously.   And now I'm having a problem replying to people who have submitted forms if they have a gmail account.  Is this a common problem?

I click the "i am not a robot" button then wait for it to process.  I see the checkmark.  I press send.  Nothing.  Again and again.

Just to clarify, do you want to send multiple recipients a notification email?

Previously we allowed multiple recipients on all plans. But recently we have introduced new controls.

The FREE plan can only send one recipient per email. If you want to send more then you need to create another email notification. Or you can upgrade to any paid plan. Paid plans are limited to 10 recipients.