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Title
451 4.7.0 temporary server error. Please try again later. PRX4 -
Description
When a Notes user sends a message to an Outlook user, the Domino Console and Coexistence Manager for Notes (CMN) Mail Connector SMTP log shows the following:
Domino Console
03/04/2015 04:58:38 PM [0988:000D-0884] SMTPClient: ReceiveResponse: 451 4.7.0 Temporary server error. Please try again later. PRX403/04/2015 04:58:38 PM [0988:000D-0884] SMTPClient: Attempting to Disconnect:03/04/2015 04:58:38 PM [0988:000D-0884] SMTPClient: CommandQUIT:03/04/2015 04:58:38 PM [0988:000D-0884] SMTPClient: ReceiveResponse: 221 2.0.0 Service closing transmission channel03/04/2015 04:58:38 PM [0988:000D-0884] SMTPClient: Connection terminated successfullyCMN Mail Connector SMTP log2015-03-04 16:58:38,521 DEBUG SmtpProtocol.logging [Proxy 1] - Message Number [1] on Thread [10] from Domino (XX.X.XX.XX:49632) to Exchange (XX.X.XX.X:25): Received response: 451 4.7.0 Temporary server error. Please try again later. PRX42015-03-04 16:58:38,521 DEBUG SmtpProtocol.logging [Proxy 1] - Message Number [1] on Thread [10] from Domino (XX.X.XX.XX:49632) to Exchange (XX.X.XX.X:25): Sending response: 451 4.7.0 Temporary server error. Please try again later. PRX4Exchange server version: 2013 -
Cause
The Exchange Receive Connector that is accepting the connection from CMN Mail Connector is created as Front End Transport. -
Resolution
To resolve this issue:
1- Disable the problematic Front End Transport connector
2- Create a Hub Transport Receive connector
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Additional Information
Front End Transport connectors are usually used for incoming connections from another Exchange organization.