Ilan Shalif wrote:

Me just request to direction to the documentation of the mechanism of dovecot. Specificly about the mechanism dovecot deal with the request to leave posts on the server, the duration, and the finishing of this mode.

I think you are talking about POP?

Basically POP just has commands to download an email and to delete an email. So if you tick this option in your email program basically it just does the download commands and "forgets" to do the delete commands at the end of the session.

Ed W