Problems with OSX Mail

Hi guys! Hope all is well. I am having serious issues with my cPanel setup. I installed the latest cPanel/WHM software and so far all my services are running OK including: Websites Webmail service Email service on new clients like Outlook 2016 However I am having issues with older Outlook mail clients (2003,2007 and 2010) and Apple Mail configuring IMAP accounts. First, the autoconfiguration in Apple and outlook don't detect SSL settings (that are detected correctly on newer clients) and secondly the SMTP server doesn't work at all. I can't add the checkbox to authenticate before sending emails because mail never goes out. If I remove the setting I can't relay (for obvious reasons). I can't send emails using any of the ports (25, 465 and 587) without SSL. if I enable SSL it doesn't work either so I'm stuck and I have machines running OSX Mail and don't want to change client. I tried changing the SSL cyphers to the following but the issues persist: ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS Any suggestions? Thanks! Teo