I am desperately trying to get Lazy Approval working within my farm. We run SharePoint 2016, on premise, along with Nintex Forms and Workflow (2016). We have 2 x web front end servers, and 2 x app servers. The 2 x WFE servers are load balanced using Kemp Load Balancer. We also run Exchange 2016 on premise. All set up is, I think, correct as far as configuration in Central Administration. I have the SMTP service set up on both the app servers and configured accordingly. I have a dummy workflow for testing, I get the task through via email, I respond with a term - i.e. approve. The mailbox gets the email (I added my user to the mailbox with full permission so I could see) but nothing else happens on the workflow. What am I missing? Guidance is hazy at best. Really would like this up and running but keeping on hitting dead ends. Help!
If you set up incoming email settings correclty then you should be file. Just to make sure you did: Did you follow the steps mentioned here?
You'll havo to configure your load balancer to forward incoming emails to servers with the SMTP service enabled.
You can also scan the ULS logs for anything related to EmailDropReciever to check if something happens behind the scenes.