ios18 email problem

I’m having numerous email problems since upgrading to iOS18. Here are a couple of examples:

• I have an IMAP email account that gets an error message that says “the mail server is not responding…”. It was working fine prior to iOS18 and I can’t get it to work with iOS18. I’ve been forced to use an Outlook email client until Apple fixes this problem.
• My wife’s iOS mail on her iPad was defaulting to the wrong email account even though the default email account was correctly set in settings. The way I had to fix it was to delete the email account that is not the default and then restore it.
• Another problem is the iOS mail client no longer shows saved mail folders.

I hope Apple knows about these problems and fixes them.