Receive Connector


SMTP server error: 5.7.1 Unable to relay

I am receiving much requests to fix errors like ‘SMTP server error: 5.7.1 Unable to relay’. This is happening mostly when a non-Exchange server is trying to send through Exchange Servers for example an application tries to send through Exchange server like news letters, may be SharePoint etc. To relay mail, we need to create a Receive Connector on […]