AT&T Mail needs a secure mail key: a password made just for mail apps.
Steps
- In Mailzo, click Connect an inbox, type your AT&T address and click Continue.
- Click Open your AT&T profile in Mailzo, or go to your AT&T profile, and sign in.
- Choose Sign-in info, then find Secure mail key.
- Click Add secure mail key, pick your email address and name it Mailzo.
- Copy the key AT&T shows. It's only shown once.
- Paste it into Paste it here in Mailzo and click Connect inbox.

One key for Mailzo is enough, even if you use it on several Macs.
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