On Tue, Aug 11, 2015 at 11:05:38PM +0200, Alexander Dalloz wrote: > openssl s_client -connect <server ip>:993 > > You hopefully see a greeting message from the IMAP server. Then issue I know I'm late to this thread, but a useful tool for testing your Cyrus IMAP service is the 'imtest' command, which is in the cyrus-imapd-utils package. imtest -v -s <serverip|hostname> (I used to manage a cyrus murder, a long time ago, and imtest is a great tool for debugging) However, your issue sounds more like a network-level problem than a IMAPd problem. -- Jonathan Billings <billings at negate.org>