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Unable to send mail from my account Tiscali (vaincez@tiscalinet.it)

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From some months I cannot send mail from my account Tiscali : vaincez@tiscalinet.it. After sending message I receive the following error message:

"Invio del messaggio non riuscito. Si è verificato un errore durante l’invio della posta. Il server di posta ha risposto: MAIL FROM:<vaincez@tiscalinet.it> does not match authenticated user name. Verificare l’indirizzo email nelle impostazioni dell’account e riprovare."

On the same account I receive regularly mail message. Through the TISCALI website I have no problem. I have just submitted the problem to Mozilla Support with ticket ID 194931. Thanks in advance for your help.

From some months I cannot send mail from my account Tiscali : vaincez@tiscalinet.it. After sending message I receive the following error message: "Invio del messaggio non riuscito. Si è verificato un errore durante l’invio della posta. Il server di posta ha risposto: MAIL FROM:<vaincez@tiscalinet.it> does not match authenticated user name. Verificare l’indirizzo email nelle impostazioni dell’account e riprovare." On the same account I receive regularly mail message. Through the TISCALI website I have no problem. I have just submitted the problem to Mozilla Support with ticket ID 194931. Thanks in advance for your help.