Email# Messaging <span class="badge-status">Reserved for administrators</span> ## Suppliers **Settings → Mail** configures custom SMTP/SMTP2GO, Google Workspace via Gmail API or Microsoft 365 via Graph. Fields include sender, reply, server, port, encryption, identifier, and OAuth parameters. ## Configuration For OAuth, enter Client ID and secret, declare the displayed callback URI then connect the account. `APP_URL` must be the exact HTTPS origin. Enable the configuration for notifications and use the test form. ## Security and troubleshooting Passwords, secrets and tokens are encrypted with libsodium and do not return to the API. If this fails, check the Messenger worker, `gmail.send` or `Mail.Send` rights, and Mailpit locally. ## Choose and configure | Supplier | Main fields | | --- | --- | | SMTP | server, port, encryption, username, password, sender | | Google Workspace | Client ID, OAuth secret, sender and connected account | | Microsoft 365 | Client ID, tenant, OAuth secret,