I have a POP3 account and defined that no mails will be stored after downloading in Thunderbird. Each time when Thunderbird checks for new mail or after start of Thunderbird I am receiveing the same mail from a particular sender, which I received originally yesterday. All new mails after a certain time yesterday will not be read and downloaded to my PC. When I am using the Webmail facility or when I look in Gmail, where also mail of this particular account is forwarded, I can see that I have received new mails, but they will not be seen/downloaded by Thunderbird (latest version). With other e-mail accounts I do not have this problem in Thunderbird. Please advise me how to fix this problem.