530 5.7.1 Client was not authenticated Exchange 2010

Problem:

After new installation you are able to sent mail out but not able to receive emails.The sending host is receiving fallowing command on SMTP handshake from your mail server “530 5.7.1 Client was not authenticated”

Solution:

I had one of my previous post same issue with Exchange 2007, please do remember, the product exchange is being delivered to you totally secure, and even anonymous access has not been turned off, you as an Exchange administrator must turn it on .

To understand and see the your mail server response , you will need to open telnet session to your mail server and use standard SMTP commands to see the mail server response and what is going on so you can remedy the problems.

• lets start installing
• Telnet client first

Open DOS or PowerShell and type below

servermanagercmd -install telnet-client

Now on the same screen type

helo ( hit enter) 220 mail2.smtp25.org Microsoft ESMTP MAIL Service 250 mail2.smtp25.org Hello [10.10.10.10] mail from:Telnet25@Gmail.com ( Use yours) hit enter 530 5.7.1 Client was not authenticated

As you see the server response is “530 5.7.1 Client was not authenticated”

Now lets take care of that, open EMC , go under your Server configuration, hub transport server default receive connector, properties, click on last tab “permission Groups” place check mark into “Anonymous users” click apply and ok.

Now go back to DOS window we opened earlier,

telnet to your mail server on port 25 one more time,

this time you will get

Telnet mail3 25 220 mail3.smtp25.org Helo 250 mail3.smtp25.org Hello mail from:telnet25@Gmail.com 250 2.1.0 Sender OK

Now your mail server is ready to accept mails from outside

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Oz Casey Dedeal

MVP (Exchange)
MCITP (EMA), MCITP (SA)
MCSE 2003, M+, S+, MCDST
Security+, Project +, Server +

http://smtp25.blogspot.com/ (Blog)

https://telnet25.spaces.live.com/ (Blog)

https://telnet25.worldpress.com/ (Blog)