Email module does not return emails

Imap/pop3 marketplace widget – upgraded it to latest version. Every now and then it returns an e-email, but must of the emails are not returned from the server and put in the Emailmessage files (which, by the way, in this newest version is not a parameter anymore – but the email widget assumes this is the proper entity name). No errors and proper signin into the server. Documentation on settings or regular use is far too limited to solve this issue. Anyone any clue?  
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