Network Log says (tried twice): * Account 'sdfg16': Connecting to SMTP server: mail.riseup.net:25... * Account 'sdfg16': Connecting to SMTP server: mail.riseup.net:25... and that's it! The set up is as described in the Riseup guidance.
upgrade to the latest release, here: http://www.claws-mail.org/win32/ If you still get the problem, use the users' mailing list or IRC to discuss it. http://www.claws-mail.org/MLs.php