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e mail will not let me send

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I keep getting message saying: An error occurred while sending mail. The mail server responded: 554 5.7.1 Message rejected due to possible spam content. Please check the message and try again.

I keep getting message saying: An error occurred while sending mail. The mail server responded: 554 5.7.1 Message rejected due to possible spam content. Please check the message and try again.

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what mail provider? have you asked them why they are refusing your mail? The message is from your provider, not Thunderbird.