An App Password is a provider-issued credential used to allow third-party systems (such as FAOS) to send emails through your mailbox without exposing your primary account password.
App Passwords are typically used when OAuth is not available for SMTP sending, or when your email provider requires a dedicated credential for external applications.
2-Step Verification must be enabled before App Passwords become available.
FAOS does not control your email provider’s policies, sending limits, spam filtering, or account suspension rules. Email delivery depends on your provider’s configuration and compliance with its terms of service.
Related references: Email System · Email Auth Options · Terms