[Users] Ghost emails / very strange POP behavior

[Paul]

On Mon, 30 May 2016 23:33:18 +0200
Michael <codejodler at gmx.ch> wrote: 

> My best gess is they DID went in but somehow got 'lost' or hidden
> by claws; abd then, with the new reply, suddenly became visible
> again ?
> 
> That's why i'm asking you. Is it possible ? WHAT would be possible
> at all here ?

In Claws Mail, when you elect to leave mails on the server, Claws
Mail keeps a list of UIDLs (unique identifiers) in a file
~/.claws-mail/uidl/ named [SERVER]-[EMAIL ADDRESS]. This is how it
knows what it's already got, and when to remove them from the server.

It is not possible for Claws Mail to hide messages on the server from
other clients, (including webmail).

with regards

Paul