Add a strong restriction on non-existent senders
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@@ -105,6 +105,7 @@ smtpd_sender_restrictions =
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permit_mynetworks,
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permit_mynetworks,
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reject_non_fqdn_sender,
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reject_non_fqdn_sender,
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reject_unknown_sender_domain,
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reject_unknown_sender_domain,
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reject_unlisted_sender,
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reject_sender_login_mismatch,
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reject_sender_login_mismatch,
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permit
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permit
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