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Reason:4.1.0 - Unknown address error('451',[TLS/SSLv3 connection req]

MuhtaromWidodo
Beginner
Beginner

Hi,

When I am looking to email tracking, I see error message delayed Reason:4.1.0 - Unknown address error('451',[TLS/SSLv3 connection required. (#4.7.1)']

I am new on managing ironport,

Could you tell me what error is it?I believe that TLS is already activated on ironport

1 Reply 1

UdupiKrishna
Cisco Employee
Cisco Employee

If this is an incoming email, ensure TLS is set to preferred under the mail flow policy matching these connections. Here's an example of "ACCEPTED" mail flow policy

 

Screenshot 2022-06-10 at 1.32.04 PM.png

 

If this is an outgoing email, ensure TLS is turned on under destination controls. Here's an example of "default" destination controls where TLS is set to preferred

Screenshot 2022-06-10 at 1.33.27 PM.png

 

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