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I am having trouble sending emails to education personnel. What is the error 5A1F320A111BF999?

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I am having trouble sending emails to education personnel. I get the following error 'An error occurred while sending mail. The mail server responded: 5A1F320A111BF999 Message content rejected due to suspected spam. OB703. Please check the message and try again.'

I am having trouble sending emails to education personnel. I get the following error 'An error occurred while sending mail. The mail server responded: 5A1F320A111BF999 Message content rejected due to suspected spam. OB703. Please check the message and try again.'

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This is the answer from your outgoing server, not from Thunderbird. Probably you've sent e-mail to too many people.