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IMAP stopped working with Thunderbird email client

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IMAP stopped working with Thunderbird email client

Using Thunderbird version 45.8.0 email client for IMAP access to Comcast email account. Thunderbird has been working without a problem for years. Just stopped working today. Error message is: "Login to server imap.comcast.net failed."

Not a password problem. Can access Comcast email account with password using webmail and Microsoft Outlook.

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