Greetings wise wizards of EE:
I'm helping a friend who has a fairly new iMac, running El Capitan, and Microsoft Office 2016 for Mac. I sent up an IMAP account with his @sbcglobal.net e-mail (from AT&T), which is able to send and receive. However, it constantly prompts him to input his smtp password, and I have confirmed that the smtp settings and port number is correct. I have tried every possible AT&T server settings, and I check "Keep this password in the keychain". He typically inputs his password in the morning, and ignores all requests that appear after (usually several per day) and his email then sends normally. This issue is not preventing him from using his e-mail, but it is highly irritating.
I am convinced it is either a Microsoft application or operating system issue. Both Office & El Capitan are up to date.
Please advice to make this incredibly annoying error message exist no more!
Many thanks in advance,