always when trying to create an IMAP account Zimbra Desktop to my provider I get a "service.FAILURE: system failure: Unable to connect to IMAP server: DataSource: { id=8497658b-d2d7-40fd-9c03-e3ab823d8606, type=imap, isEnabled=true ..."

It works weel with e.g. Thunderbird, so it can't be a general connetion issue. The server is inbound "pop.kontent.com" (yes, 'pop' for IMAP) or smtp "mail.kontent.com".

Other providers are no problem.

Any idea?