Airmail allows you to use OmniFocus to remind you to reply or act upon a message.
1. Ensure that you install and open OmniFocus at least once before opening Airmail and then go to Airmail Preferences > Services and enable Omnifocus as shown in the picture below.
2. Right click an email and choose 'Send to' and then choose 'Create OmniFocus Task' (We recommend to use the shortcut key 'Z'). If you do not see 'Create OmniFocus Task’ check that OmniFocus is installed and reopen Airmail.
3. A OmniFocus window should appear, if desired enter a project, context or change the title and click 'Save’.