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How can I get past DELE command did not succeed error at sign on?

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When I sign on to Mozilla to get email, after "checking for new messages", I get the error massage that says - The DELE command did not succeed. Error marking a message as deleted. Mail server inbound.ATT.net responded too many requests. Email was previously working fine & all settings are correct. How can I eliminate this month old problem & get back to being able to receive my emails?

When I sign on to Mozilla to get email, after "checking for new messages", I get the error massage that says - The DELE command did not succeed. Error marking a message as deleted. Mail server inbound.ATT.net responded too many requests. Email was previously working fine & all settings are correct. How can I eliminate this month old problem & get back to being able to receive my emails?

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You do not sign into Thunderbird. You or if you saved your password, Thunderbird provides the password when your providers server asks for one. The error is from your providers server. What did they say when you asked them?

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I have this problem too. !!!! How do we fix it ????