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Note: Microsoft/Google/Gmx can disable your account if you use it to send large amounts of email. Try adding an exclusion for calibre in your antivirus program. One common source of problems is that some poorly designed antivirus programs block calibre from opening a connection to send email. Even after doing this, you may have problems. Also note that Amazon does not allow email delivery of AZW3 and new style (KF8) MOBI files. If you are sending to your Kindle, remember to update the email preferences on your Amazon Kindle page to allow email sent from your GMX email address.calibre will then be able to use GMX to send the mail.Log into your GMX account on the website and enable SMTP sending (Settings->POP3 & IMAP->Send and receive emails via external program).Goto Preferences→Sharing→Sharing books by email in calibre and click the Use GMX button and fill in the information asked for.The most robust way to setup email sending in calibre is to do the following: Many servers (for example, Amazon) block email that does not come from a well known relay. The most common problem is if you are sending email directly (without a mail relay) in calibre. 9.2.10 I cannot send emails using calibre? Because of the large amount of spam in email, sending email can be tricky, as different mail servers use different strategies to block email. For such devices, you can simply add /mobile to the server URL to get a simplified, non-javascript interface. Also some devices do not have browsers advanced enough to run the app-like interface used by the content server.
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In this case the simplest solution is to adjust your router to forward requests on port 80 to port 8080). (On some operating systems, you may not be able to run the server on a port number less than 1024 because of security settings. In that case, change the port in the calibre Preferences to 80. Some devices, like the Kindle (1/2/DX), do not allow you to access port 8080 (the default port on which the content server runs). See The calibre Content server (page 113) for details. 9.2.9 Can I access my calibre books using the web browser in my Kindle or other reading device? calibre has a Content server that exports the books in calibre as a web page. You can now browse the calibre library and download directly into the reading software.
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To add a catalog, then give the catalog a title such as “calibre” and provide the URL listed above.
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