AppleMail stopped sending email on 2 Macs and 1 iphone. ISP is Earthlink
Applemail. Ventura 13.2.1. Two identical Macs (mini) and 1 iPhone, all up to date, quit sending mail 5 days ago. No changes to any settings were made prior to that. Both Macs use same email address. Neither Earthlink nor AppleCare could find the problem.
Mac mini, macOS 13.2