Having just spent an agonising 20 mins on the phone yet again with a senior adviser, I just do not believe there is any recognition from Apple that there is even an issue. He yet again lectured me for 5 mins on the benefits of IMAP over Pop, he then blamed my isp (BT in the Uk) only for me to point out that my iPhone which is still running IOS 8 is working fine with POP mail. My isp also ensures me that BTMAIL is fully compatable with POp settings. As a short term fixed , I have reset my desktop mail program to only delete emails from the server once deleted from the inbox, however this does not solve the sent mail issue. I had also set up a imap account on my program, so all sent mails were stored in the IMAP program and synced with server. However, the senior advisor then told me that this was the probable cause of the issue, and advised me to delete the imap settings! Like everyone, I too have the memory issue, with the memorry rising to approx 60 and 80 me before somehow reducing to 20mb. Prior to IOS 9 mymail memory was pros 500 mb. All in all the advisor was absolutely no help, and did not even seem to have a grasp there is an issue. I will fill in yet another feedback form and send off this evening, this will be my 10th in 2 weeks!