The value of the setting
discourse.conf is the domain passed to the SMTP server. Additionally, the value of the setting "notification email" will be used as the "from" email address when sending all essential system emails. That domain must have SPF, DKIM and reverse PTR records set correctly for email to arrive.
You can also check the Discourse log,
/opt/bitnami/apps/discourse/htdocs/log/production.log, for any mail related message.
Hope it helps.
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