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thunderbird email

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Unable to SEND email messages on thunderbird, This problem just started last week. I have a desk top computer, CenturyLink is my browser, Norton I have talked to and they say it is not a Norton problem as the message has no Norton logo or any other message refering to Norton. The error message reads: outgoing server (smtp) error The Server Responded: (C20) messanger blocked

Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: [C20] Message blocked..

Unable to SEND email messages on thunderbird, This problem just started last week. I have a desk top computer, CenturyLink is my browser, Norton I have talked to and they say it is not a Norton problem as the message has no Norton logo or any other message refering to Norton. The error message reads: outgoing server (smtp) error The Server Responded: (C20) messanger blocked Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: [C20] Message blocked..