Version: (using KDE Devel) Installed from: Compiled sources OS: Other http://kmail.kde.org/manual/faq.html#id2793416 sais, KMail does not support SMTP Authentication, http://kontact.kde.org/kmail/features.php -> General features reports support for SMTP Authentication and http://kontact.kde.org/kmail/security.php sais: Issues that are more or less KMail specific Authentication: SMTP Auth, PLAIN, LOGIN, CRAM-MD5, DIGEST-MD5, APOP Do the two websites have inconsistent opinion on smtp authentication support in kmail .
Think this is not valid anymore. kmail.kde.org is moved and its current feature description is corrected