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Unable to access email through Thunderbird

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For the past two weeks, I keep getting the error "Sending of password for user w***y@att.net did not succeed. Mail server inbound.att.net responded: Server error - Please try again later." According to ATT, they're saying it's Thunderbird's fault. Any suggestions?

For the past two weeks, I keep getting the error "Sending of password for user w***y@att.net did not succeed. Mail server inbound.att.net responded: Server error - Please try again later." According to ATT, they're saying it's Thunderbird's fault. Any suggestions?

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Isisombululo esiKhethiweyo

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This ticks me off. So the solution did fix my problem but then are you saying that Mozilla KNOWS this is a issue with Thunderbird but continues to not fix it?

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I wouldn't say it's a problem that TB is ignoring, as TB has no control over the requirements imposed by mail providers, but instead it indicates the failure of AT&T to inform its users of the changing security requirements - which apply to all desktop mail clients, not just TB.