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why can't I send emails?

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I can receive emails but now cannot send emails on thunderbird

I can receive emails but now cannot send emails on thunderbird

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Perhaps you might share enough information for someone to take a guess. We know exactly what you tell us. At this point we have enough information to know you apparently have a problem. Nothing more.

The error message you get after you send would be a very good start,  as will as details of the email provider and any antivirus or internet protection suite.