That workaround is confirmed for older Outlook under XP? 2003 2007? I have tried to reproduce the issue with an worst-case setup (Outlook 2003 under XP). And SMTP under cPanel 68 with Exim 4.89 isn't working with the workaround. Perhaps it is better that way ;-) Looks to me like Exim has some fixes in 4.89 which may prevent the successful transfer even when cipher and protocols are available. Will at least help to motivate everyone to move on to TLS 1.2 and 1.3.