Mail box access via php: Connection refused

I need to read INBOX letters at 3-rd part's mail server, with php script. I tried to connect via imap_open, but received "connection refused" message. Port 143. I need someone to make working php script for access to my INBOX (I will provide details of mailbox). My mail client defined "STARTTLS" encription is used by mail server (possibly this info will help you). P.S. I tried already flags /novalidate-cert, /tls(/notls), /norsh for imap_open