When sending email to individuals it works fine. When using a distribution group it gets returned:
"Delivery status : Failed. Message could not be delivered to domain <miamilighthouse.org> .501; 5.5.4 Unrecognized parameter MTA Response :501 The original message headers are included as attachment.
"Delivery status : Failed. Message could not be delivered to domain <miamilighthouse.org> .501; 5.5.4 Unrecognized parameter MTA Response :501 The original message headers are included as attachment.