The next expected update to iOS version 13.2 is scheduled to be released on 9/24/2019. For those users that are experiencing this issue, there are a couple of options that work to replace the built-in iOS Mail app:
Our webmail site is already set up and ready for use. Just open Safari on your mobile device, enter the URL, and login with your Email Address and Mailbox Password (the same you use on your phone).
Users can also add a Shortcut to the iPhone Home page for the site, and/or Bookmark it for easy reference.
- Use another Email App, such as Outlook for iOS
Outlook on iOS has been tested and works well to connect to users' MRSware Mailboxes. Make sure to select "use custom settings" and "IMAP" when adding your account. The settings are the same you used with the iOS Mail app.
Hopefully, the next iOS update resolves these initial update issues, but if not and in any case, you do have options. And all of these options can be setup and used interchangeably, so that you always have access to your email no matter what one app might do or errors an update might cause.