Configuração 'E-mail em grupos permitidos' é muito permissiva.

[Lilly]

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Configuring incoming email to create new topics or group messages

This guide explains how to set up incoming emails to create new topics or group messages in Discourse, including configuration of site settings and category or group-specific settings. Required user level: Administrator This guide covers: Enabling and configuring incoming emails Choosing between category and group for incoming emails Setting up incoming emails for a group Setting up incoming emails for a category Deciding how forwarded emails are handled …