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I obtain my Internet service from CenturyLink.

I have been using for many years Mozilla Thunderbird for my email.

Recently, the following message has started popping up after I compose an email in Thunderbird and hit the Send button:

"An error occurred while sending mail: The mail server sent an incorrect greeting: 5.7.1 [C1 RBL restriction: Blacklisted by Internal Reputation Service - 23.83.131.210."

I reinstalled Thunderbird as a possible remedy. The problem persists.

Please help.

I obtain my Internet service from CenturyLink. I have been using for many years Mozilla Thunderbird for my email. Recently, the following message has started popping up after I compose an email in Thunderbird and hit the Send button: "An error occurred while sending mail: The mail server sent an incorrect greeting: 5.7.1 [C1 RBL restriction: Blacklisted by Internal Reputation Service - 23.83.131.210." I reinstalled Thunderbird as a possible remedy. The problem persists. Please help.

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the message is saying the ip address 23.83.131.210. is blacklisted for sending spam.

That address appears to be registered to Leaseweb USA in Phoenix. So I assume you are getting internet services of some sort from them and their address is blacklisted. I suggest you talk to them.

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the message is saying the ip address 23.83.131.210. is blacklisted for sending spam.

That address appears to be registered to Leaseweb USA in Phoenix. So I assume you are getting internet services of some sort from them and their address is blacklisted. I suggest you talk to them.