Mail bounce back message
I get a mail bounce back when I send to a certain single domain only:
Server refused mail at MAIL FROM - 530 5.7.1 Client was not authenticated
I do not receive a bounce back from any other domain.
Is the configuration issue on the recipients end?
Using Microsoft Exchange Server 2010, Outlook 2010 and Cisco IronPort mail gateways on the sender side.
Any information appreciated.
Server refused mail at MAIL FROM - 530 5.7.1 Client was not authenticated
I do not receive a bounce back from any other domain.
Is the configuration issue on the recipients end?
Using Microsoft Exchange Server 2010, Outlook 2010 and Cisco IronPort mail gateways on the sender side.
Any information appreciated.
Amit Kumar
Make sure you have added affected domain in Accepted domain for Ironport and Exchange. Seems they are denying to route e-mail using affected domain.
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ASKER
I have Anonymous Users allowed for my MS Exchange and Cisco IronPort so didn't think it was sender problem.
Also sender only having issue with one specific domain.
Also sender only having issue with one specific domain.
I assume you've locked it down to IP right?
ASKER
I assume you've locked it down to IP right? - Please explain?
https://social.technet.microsoft.com/Forums/exchange/en-US/a8077118-8530-4e79-aeb1-90a1c781b1fb/is-opening-the-receiving-connector-to-anonymous-really-a-security-risk-?forum=exchangesvradminlegacy
You need to lock down your exchange so only specific IP addresses can communicate anonymously. Otherwise people can you use as a relay
You need to lock down your exchange so only specific IP addresses can communicate anonymously. Otherwise people can you use as a relay
ASKER
Thanks for clarification and agreed - we only use 2 Mail Gateway IP Address to relay from the internet
ASKER
Thanks for assisstance