Most users should select Split Address mode , which treats each of your email aliases as a separate account.
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Open your preferred client (Thunderbird is the most common choice for Linux). Create a new account with these settings: 127.0.0.1 Outgoing (SMTP): 127.0.0.1 Username: Your full ProtonMail email address. Password: Use the unique password generated by the Bridge. Most users should select Split Address mode ,
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Check if your firewall is blocking the local ports (1143 and 1025).