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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Have you tried to send multiple ebooks in a short period of time, via Calibre?
That could be a reason for the recipient blocking the IP, thinking it's spam.
Try with another email provider, maybe?
By default, Calibre allows 5 minutes or so between each ebook sent, to avoid the spam issue. Personally, I disabled that setting. So far, so good. I never send more than 2 or 3 ebooks at a time, more often only one.