frontier email can't be sent
ios 14. Can't send emails. We use Frontier. Receive fine, no send. Started happening when we switched to Spectrum cable modem to access the internet. Frontier, Spectrum both say it's not their problem. Frontier sent us an email that they now use OAuth2 authorization, but that's not available as an option on Mac Mail, both ios and os.
HELP!
Frank
iMac 27″, macOS 10.13