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Can't send e-mail

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What does the following mean? And how can I fix it? I received this error report while trying to send an email.

An error occurred while sending mail. The mail server responded: 5.7.1 The message contains an unauthorized custom from address because the 5.7.1 associated account has been disabled or deleted. Please revalidate 5.7.1 the custom from if you believe this to be in error. bx2sm3277681wjb.47 - gsmtp. Please check the message and try again.

What does the following mean? And how can I fix it? I received this error report while trying to send an email. An error occurred while sending mail. The mail server responded: 5.7.1 The message contains an unauthorized custom from address because the 5.7.1 associated account has been disabled or deleted. Please revalidate 5.7.1 the custom from if you believe this to be in error. bx2sm3277681wjb.47 - gsmtp. Please check the message and try again.

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