In some places Internet access is available only via proxy, which in practice means that you are limited to HTTP and HTTPS protocols only.  But if you have  external email accounts like Gmail,  this is bit limiting, because you cannot access your email via IMAP protocol from your  email client.

However there can be a solution –  if proxy support HTTPS protocol, it means also that it supports CONNECT method that  tunnels a connection to remote server unchanged.  This method could be used to tunnel any protocol, so basically  it could tunnel also IMAP ( and SMTP for outgoing email). Continue reading Accessing IMAP/SMTP via HTTPS Proxy →