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Most likely the problem arose because your ISP changed their mail server and no longer accepts SSL or TLS connections on the port you are using. Another option is that they changed to pop-authenticate-before-send. Or introduced a mail proxy. Or any number of other options.
As for whether there is a fix: of course there is. All you need to do is figure out what protocol your ISP wants, then change calibre's code to use it. Voila!
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