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I have an domain with an email@example.com account in it. As the name suggests it is used to have various tools and sites send mail though out Smartermail mail server. When I add this account to Thunderbird I'm able to send message no problem, but when an external party from the Ukraine sends a message they get "550 Outgoing SMTP is not allowed"
Is there some setting within smartermail where I can enable/disable certain countries ?