Hi everyone! I have this behavior in my mail server with ISPConfig and I don't know how to solve it. When a MUA (thunderbird or outlook) connected trouth pop3 and the config not have tha option "let a copy of mails for x days" some mails lost. I see the logs of the mail account and I can see that client have 3 mail in the inbox, the MUA connected read mails but just 1 is downloaded and the others disappear form the inbox. The only solution enable the option "let a copy of mails for x days" but I think that it should not be necessary. Anyone has this happened before? Thank you for your help!