Quote:
Originally Posted by Tacit57
SMTP error from remote server for RCPT TO command, host: inbound-smtp.us-east-1.amazonaws.com (54.164.173.191) reason: 550 5.7.1 IP address blacklisted by recipient
Nothing helps, Calibre becameto be useless for sening books
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Are you trying to send directly to your Kindle email from calibre rather than using GMX/whatever as a relay?