On one of my computers, KMail every day retrieves again the same mails that are already retrieved and not yet deleted in the provider's POP3 mailbox. This forces me to do a “delete double messages” operation a few times a day. This has begin recently, about a week ago; before, I never experienced it (and I use KMail since 20 years!), and neither on my other computers. How can I stop this nasty habit? Thankx for any suggestions!