Outgoing mail whitelisting
I need to restrict some email addresses to send emails to specific domains. For example, email@example.com should only be able to send emails to firstname.lastname@example.org and email@example.com but firstname.lastname@example.org shouldn't be able to send emails to any domain other than these two. In other words, an email from email@example.com shouldn't go to firstname.lastname@example.org
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