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Keep getting 5.7.1 authorization needed

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Just switched to Thunderbird 38.....cannot send out emails....keep getting 5.7.1 authentication needed. Can receive mail. can receive and send directly from ISP email website.  ??

Just switched to Thunderbird 38.....cannot send out emails....keep getting 5.7.1 authentication needed. Can receive mail. can receive and send directly from ISP email website. ??

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Please post this info:

In Thunderbird Help > Troubleshooting Information click on 'copy text to clipboard'

In this forum question, right click in a 'Post a Reply' box and select : 'Paste' You can edit/remove all info on fonts and printers but nothing else.