Fastmail needs an app password. Your normal Fastmail password won't work in Mailzo.
Steps
- In Mailzo, click Connect an inbox, type your Fastmail address and click Continue.
- Click Open Fastmail security in Mailzo, or go to Fastmail security settings, and sign in.
- Click Manage app passwords, then New app password.
- Name it Mailzo and for access choose Mail (IMAP, POP and SMTP).
- Click Generate password and copy it.
- Paste it into Paste it here in Mailzo and click Connect inbox.
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