This new addition to Boomerang for Gmail and Outlook helps you craft messages that are more likely to get a response. Some features are free; others will cost you.
https://www.cnet.com/how-to/write-better-emails-with-respondable/
DawsonITE is a blog devoted to Educational Technology. It's compiled by Rafael Scapin, Coordinator of Educational Technology at Dawson College in Montreal (Canada).