Full Error Message:
Subject: Apex governor limit warning
By user/organization: XXXXXXX/XXXXXXXX
Caused the following Apex resource warnings:
esign:Number of Email Invocations: 7 out of 10
(these emails can be disabled from the user detail page for this user)
Reason for Error/How to resolve:
This error can happen when trying to add more than 10 attachments in one email. To resolve, please upgrade your app package to what we have posted on AppExchange (make sure you are only logged into related Salesforce org that error is coming from when upgrading your package): https://appexchange.salesforce.com/appxListingDetail?listingId=a0N30000000q4LeEAI.
Once you have the new package installed, go to eSign configuration tab and refresh your authorization. Then test again in same way you did before and see if error resolved. If not resolved, please submit a case to A5 Apps Support with your detailed steps and provide login access to org.