550 5.7.1 Client does not have permissions to send as this sender
When configuring the receive connector in Exchange 2007, I find out that users using SMTP email client like Outlook Express and Thunderbird can receive email but cannot sent email through Exchange as the SMTP server. They get the following error:
“Protocol: SMTP, Server Response: ‘550 5.7.1 Client does not have permissions to send as this sender’, Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC78”
Microsoft documentation said that the error happen because:
The sender specified in the MAIL FROM field of the SMTP protocol conversation is an address in an authoritative domain. However, the session doesn’t have the ms-Exch-SMTP-Accept-Authoritative-Domain-Sender permission. This might occur if a message was submitted from the Internet to an Edge Transport server from a sender address for which the Exchange organization is authoritative.
To fix this problem, I need to grant the Authenticated users group the “Accept Authoritative Domain Sender” allow permission for the receive connector.
I use ADSIEdit to find and edit the receive connector.
In ADSIEdit under : Configuration – Services – Microsoft Exchange -<organization name> – Administrative Groups – Exchange Administrative Group – Servers – <Servername> – Protocols – SMTP Receive Connectors – Client<servername>
Right click the receive connector and click properties, click the security tab and grant the Authenticated users group the Accept Authoritative Domain Sender allow permission.
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