iOS 11.0.1 Fixes Mail Bug with Microsoft-hosted Accounts
Apple has released iOS 11.0.1, merely noting that it has “bug fixes and improvements.” However, in a separate note, Apple says this update resolves the issue with Microsoft-hosted email accounts detailed in “iOS 11 Mail Failing to Send with Microsoft-Hosted Accounts” (22 September 2017).
You can get the iOS 11.0.1 update, which is roughly 275 MB, in Settings > General > Software Update or via iTunes.
Those who were participating in the developer beta of iOS 11 may need to delete the iOS beta profile in Settings > General > Profile and restart the device to get iOS 11.0.1 to show up.
Thanks. It appears that I missed the "...and restart the device..." part of removing the beta profile. Status now: "Preparing update" (which took a remarkably long time on my iPhone the other day).
Of course the Apple-hating website ZDNet and their prime spewer of anti-Apple articles, posted this morning:
http://www.zdnet.com/article/ios-11-0-1-update-causes-havoc-for-some-iphone-and-ipad-users/
I have 11.0.1 on my iMac and Mail is terrible - No wrap around when composing (I have to compose in WORD and then copy to mail) - Mail prevents shut down unless I exit it first (I have to power off) - Lately, sometimes, it cannot move incoming mail to Trash on the first attempt. PLEASE, go back to a working Mail
I'm not quite sure what you're experiencing, but iOS 11.0.1 is for the iPhone and iPad, not for the iMac.
If you mean macOS 10.13.1, it sounds like something else is significantly wrong; Mail on the Mac has its issues, but the things you're describing are far from common.