Yahoo Mail needs an app password. Your normal Yahoo password won't work in Mailzo.
Steps
- In Mailzo, click Connect an inbox, type your Yahoo address and click Continue.
- Click Open Yahoo security in Mailzo, or go to Yahoo account security, and sign in.
- Click Generate app password (it may say Generate and manage app passwords).
- Type Mailzo as the app name and click Generate password.
- Copy the password Yahoo shows.
- Paste it into Paste it here in Mailzo and click Connect inbox.

Remove Mailzo's access
Open Yahoo account security, go to the app passwords list and remove Mailzo.
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