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How do I stop emails I send from being returned?



I have a Macbook Pro and use the Apple email service. Recently, when I send email, I often get this message back.

“I'm sorry I had to inform you that your message could not be delivered to one or more recipients.

<____>: host mx .centurylink.net [206.152.134.65] said:
554 5.7.1 [P4] Message is blocked due to spam content in the message. (in response to the end of the DATA command) ”
—–
David Korte


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