Quote:
Originally Posted by EdABG
It is pretty clear to me that the IP address has been black listed for the Recipient, which is Amazon. Question: Anyone could please tell me the IP rejected? The one in the message, 550, b'5.7.1, doesn't look a standard IP
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Are you trying to send directly from your local connection? Most consumer/residential IP ranges are permanently blacklisted to prevent spam. That's why you should send through the SMTP servers of your email provider.