Generate an app password
Open login.yahoo.com/account/security and create an app password for Orvia Mail under App passwords. Yahoo does not allow third-party clients to use your regular account password.
Add Yahoo Mail
Sign in to Yahoo Mail with an app password—not your Yahoo account password.
Use your full address and the app password
In Orvia Mail, enter your full Yahoo email address and the app password you just generated instead of your Yahoo login password.
Works with global Yahoo Mail
Supports global Yahoo domains such as yahoo.com, yahoo.co.uk, ymail.com, and rocketmail.com. Yahoo! JAPAN (yahoo.co.jp) is a separate service run by a different company and is not supported by one-tap setup yet; use a custom IMAP account if needed.
If sign-in fails
Check that you are using an app password rather than your login password, the password has no extra spaces, and the email address is complete. If it still fails, email orvia@aedc.cc with the error and screenshots.