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Thunderbird could not connect to server inbound.att.net. The connection was refused
Thunderbird could not connect to server inbound.att.net. The connection was refused
Thunderbird could not connect to server inbound.att.net. The connection was refused
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Saafara yiñ Tànn
It appears the problem was that AT&T revoked a certificate and didn't replace it until the next day. Things should be back to normal by now.