Failed emails are visible from the Emails Tab. From here it is easy to retry sending the Emails. First, ensure your email is connected:
Click on Settings
Under Personal Settings, Click Email
If your email is not connected, follow these steps to Connect it
To Resend an email:
Click on the Mail tab
Click Sent Emails
Look for the Emails with exclamation mark indicating it did not send
Click the arrow drop down to the right of the Email
Click Retry
If this has not resolved the problem please contact support through the in-app chat.