How do I troubleshoot a transactional email not being sent?

Our transactional feature is very complicated and there are three parts to it.

1. Campaign Monitor template.
2. Smart email mappings in Salesforce.
3. Process builder.

The first thing we'd suggest is to test the transactional email itself (parts 1 & 2 above) and our code that triggers the send from Campaign Monitor. You can do that easily via our mappings screen. Simply click the Run Test button which is located at the top right of the screen. Then enter a Salesforce Id from a test record (ensuring it matches the root object you are working with).

Once the code has been executed it can take up to 10 minutes for the email to be received. If the email has not been sent please contact us for further help.