The error given by the Exchange server is :
550 5.7.1 RESOLVER.RST.AuthRequired; authentication required
In order to allow emails coming from an internal sendmail server, you can disable the authentication on this distribution list :
Edit the distribution list property in the Exchange Management Console, mail flow settings tab, Message Delivery restriction and then uncheck "Require that all senders are authenticated.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5Nr8L_NYVrExMGryHgZp9CmZDHr0-XDqD5xoKjDTHFiTafkCOLEU0C8Eh_acs9OtcE9ODurWPzRABb4tK-cgukJ2SS9K6dc0jlIObXY9Ft14bCn4bFHA_x4JExmV6Tp8Dyg9mUMjyhGU/s320/distributionlist.png)
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