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Thunderbird security changes

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Cox communications has changed their security and, when making the recommended changes, a lock appears on all mail boxes and cannot send nor receive messages. need help!

Cox communications has changed their security and, when making the recommended changes, a lock appears on all mail boxes and cannot send nor receive messages. need help!

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The lock indicates a secure connection, which is recommended by Cox, but the failure to send and receive is probably due to a security program:

https://support.mozilla.org/en-US/questions/1199185

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Thunderbird support is located here : https://support.mozilla.org/en-US/ This for Firefox only. Please let us know if this solved your issue or if need further assistance.

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A moderator can move your thread over if we flag your question, so no need to repost unless you don't get any relevant responses in the next few hours.