Your POP3 server (Account: %1) does not support the UIDL command: this command is required to determine, in a reliable way, which of the mails on the server KMail has already seen before; the feature to leave the mails on the server will therefore not work properly.
Jo POP3- tsjinner (Akkount:% 1) stipet it kommando UIDL net. Dit kommando is nedich om op in betroude wei te hifkjen hokker berjochten op de tsjinner, KMail al sjoen hat. De funksje om berjochten op de tsjinner efter te litten sil hjirtroch net goed wurkje.