Settings for smtp described here: https://help.mail.ru/mail-help/mailer/popsmtp Here it is: mail-server: smtp.mail.ru username: account@mail.ru encryption SSL port: 465 auth: PLAIN Simplest case ever! But not for the mentally retarded Kmail! I can't even find out if there any logging there - notification just shows socket operation timeout
Please read https://www.kde.org/code-of-conduct/ and update your KMail version after that. 5.5.3 is old.