This is very good, and beautiful, and certainly the Mail.
But:
You allow use of "Application password" for Yahoo. On Yahoo, I need the name of the app, like "DeppinMail" with correct upper/lower case. Then they give a authorisation string that replace password. I had to guess, and did a regular IMAP log in with the code as password,, a code generated from the name I guessed.
The sollution where I scanned a QR code and accepted the log in also worked.
Please remind Yahoo that they must renew the authorisation code, send a token back in a prime number ring. They cannot use the key forever. You can easily make a security sevice that confirms authenticity of everything on a LAN using this email client t host the service. The clue is that the length is a part of the encryption,
中文 
This is very good, and beautiful, and certainly the Mail.
But:
You allow use of "Application password" for Yahoo. On Yahoo, I need the name of the app, like "DeppinMail" with correct upper/lower case. Then they give a authorisation string that replace password. I had to guess, and did a regular IMAP log in with the code as password,, a code generated from the name I guessed.
The sollution where I scanned a QR code and accepted the log in also worked.
Please remind Yahoo that they must renew the authorisation code, send a token back in a prime number ring. They cannot use the key forever. You can easily make a security sevice that confirms authenticity of everything on a LAN using this email client t host the service. The clue is that the length is a part of the encryption,
Kind regards
Knut H. Flottorp