JotNot uses Apple's built-in software and its Mail app to send its emails.  Please check out Apple's documentation on troubleshooting problems with your email from the Mail app:

https://support.apple.com/en-us/HT201419

If you are able to send an email from JotNot, but you cannot see the email in your email account's Sent folder and your recipient never received it, it typically means that your email is getting stuck in the Mail app's Outbox.  There are several possible causes: you may have lost your Internet connection during the send, or the attachment may be too big for your email server to handle, or the attachment may be just large enough that the upload to your email server timed out (especially if you're on a slow Internet connection).  You can try sending again from the Mail app's Outbox, but please wait until you are on a strong wifi connection.

For large documents, we recommend uploading them to a cloud account (such as Dropbox or Google Drive), and then emailing out a link to the document, rather than emailing the document as an attachment.  This avoids problems with limits that email servers place on the size of attachments. You can also reduce the size of your scans by changing the "File Size" setting in JotNot's Settings page to "Small" or "Smallest", so that they come in under the limit for email attachments.  If all else fails, then you may want to consider splitting your scans into several smaller documents, and emailing them separately.

If you aren't able to send from JotNot at all, either because you are getting the error message "Email Not Configured", or because the Send button in JotNot is greyed out, please check out this article instead:

https://mobitech3000.freshdesk.com/support/solutions/articles/5000707469

Please don't hesitate to contact support if you have further trouble with this, or any further questions.