Hi,
I've just found this thread as I'm having the same problem, but I'm using my hotmail email address.
I have been emailing books for years using Calibre, but now getting the blacklisted by recipient message. I have spoken to Amazon who say there is no problem. I'm not very techie, so don't know what else to try. Can anyone help please?
I have the latest version of Calibre and I've deleted all old versions and cleared my cache.
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