Stop outbound mail going to a specific domain

[Lhc_fl (Linca)]

My plugin can solve this problem.

Discourse Another SMTP

Summary This plugin allows you to add another SMTP server for sending emails to specific email addresses Repository Link Lhcfl/discourse-another-smtp (github.com) Install Guide How to install plugins in Discourse Features This plugin is very simple: it gives you some options, and the email address in the settings will use an alternative smtp server instead of the one you configured in app.yml [screenshot] What is it …

Just set the discourse_another_smtp_enabling_mails to the domains you want, and keep the other settings at default (which is invalid), you can prevent emails from being sent to these domain names.