Email Submission when email addressed to multiple users - no longer working

Email Submission when email addressed to multiple users - no longer working

I have a form that allows email submission (Public).  An email is sent to this form and the database is populated with the data.  This has been working for about 2 years without fail.  The email that comes in address to TWO email addresses.  Suddenly on June 1, this stopped working.

Was there a change to the email submission to not allow the system to process it if it has multiple recipient email addresses.  I know that I used to have to ensure that the Zoho email address was the first address in the list.