Has anyone ever had a situation where transactions (specifically Quotes and Sales Order) get emailed automatically when saving? The 'To be emailed' field is unchecked, and I cannot find any scripts or workflows that are checking it off ,or independently sending the email

It’s probably a Saved Search. You can do a search of saved searches and try to find ones were “Send Emails when records are created/updated” is checked

That would be indicated in the email header, no? I didn't see anything there

What does the

X-NetSuite

header have in it?

I am not aware of anything in the email that says it’s from a saved search unless you put something in the verbiage yourself I’ve always had to put the ID of the search in the subject or body of the email to know where it came from.

For saved searches you can get the internal id of the search from the email header

I don't see any X-Netsuite information in the sent email header