I should have looked up the 3.6.2 section first. I assumed this was the “to” address that you were trying to put multiple addresses in. However the error deals with the email origination fields; from, sender and reply to. Of these only the “from” field is set. If you read the help on the from field, it says specifically that it does not support multiple email addresses. Basically and by default, the from field is intended to be the biller’s email and gets loaded with the biller’s name for the friendly part of the address. Does this address your issue?