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Andy Kallio 13Andy Kallio 13 

What is Email.MessageIdentifier ?

Hello friends.
I just came across a process builder in a new org for me, and one of the nodes has a condition on EmailMessage.MessageIdentifier.

Is there anybody out there that can tell me what this field is for?

The documentation says it is The ID of the email message.
https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_objects_emailmessage.htm

However, I can see lots of records where this field is null, and there is also the standard Id field. Understanding that this field is doing will help me figure out what this process builder is supposed to be doing, hopefully.  Thanks!
 
Andy Kallio 13Andy Kallio 13
Just finished up a ticket with sf support team. 

We learned the following points together:
  • There is no documentation on how, when or what populates the data in this field
  • The field is populated when email client plugins are used: Lightning for Gmail, Outlook Integration. Perhaps other 3rd party plugin
  • The field is not populated on email messages created via email-to-case or auto-response emails.