mail not working after os18 install

I installed os18 on my iPad and now I can no longer send or receive emails in the mail app. I’ve deleted and reinstalled. I’ve checked my settings against settings in other device that fortunately wasn’t “upgraded” to os18. I keep getting the message:

cannot get mail

The mail server “mail.—-.com” is not responding. Verify that you have entered the correct account info in Mail settings.

The only thing that changed was os and now can’t send/receive through mail app. Help?

thanks