I have a distribution list of about 125 names and when I send an email out I get a delivery error message from the Systems Administrator saying 550 5.7.1 <email@example.com>... Relaying denied
I can send out individual emails without incident.
I often send attachments if that is relevant.
Is my list to large? I think my settings are correct.
It would be a huge help to solve this problem. Thank you in advance for any help you can offer.