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Get Messages gives this error: Login to server smtp.comcast.net with username jellis00@comcast.net failed

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When I select Get Messages inThunderbird I get the subject error and no messages are downloaded. Confirmed the IMAP and SMTP settings are correct. If I go to web Comcast.net my emails are there but won't download with Thunderbird.

When I select Get Messages inThunderbird I get the subject error and no messages are downloaded. Confirmed the IMAP and SMTP settings are correct. If I go to web Comcast.net my emails are there but won't download with Thunderbird.

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Comcast service can be ... irregular.