G Merge will send you an email when a campaign is completed and when you have exceeded Google Apps Script run time.
If you do not wish to receive these emails, please create a filter in your Gmail settings:
1. Go to your Gmail settings menu
2. Choose Filters and Blocked Addresses > Create a new filter
3. In the subject line write the Subject line of the email you no longer wish to receive > Continue
Your G Merge: Mail & Doc Merge with Attachments campaign has exceeded Google Apps Script runtime
Wizy - G Merge - Report
4. Tick Delete it > update filter