reportingMta
The reporting MTA that attempted to deliver the message, formatted as specified in RFC 3464 (mta-name-type; mta-name). The default value is dns; inbound-smtp.[region].amazonaws.com.
The reporting MTA that attempted to deliver the message, formatted as specified in RFC 3464 (mta-name-type; mta-name). The default value is dns; inbound-smtp.[region].amazonaws.com.