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Suddenly, i'm getting error message "email Not an imap4 mail server"

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After working fine last night, I woke up this morning, and could not receive emails on my thunderbird mozilla email account. I am getting the error message: "Mail server "X" is not an imap4 mail server." I have checked my settings, and they are correct, and I have not changed them recently.

After working fine last night, I woke up this morning, and could not receive emails on my thunderbird mozilla email account. I am getting the error message: "Mail server "X" is not an imap4 mail server." I have checked my settings, and they are correct, and I have not changed them recently.

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Check with your email provider if they have server problems.