Insufficient permissions on the service account (service_account@quest.com in the example) to send as another account, or having a assigned alias at the mail server.
Assign the service account the alias for your desired outbound address. Here is the procedure to do this for some common email hosts:
Microsoft Exchange: About mailboxes, addresses and aliases
Gmail: Send mail from a different address or alias
Postfix: Postfix local alias database format
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