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Is there a setting in Mailscanner or postfix to stop someone from sending from or to an email address the does not exits as a user. example: info@foo.bar or sales@foo.bar. These don't exist yet there spoofed and email is sent them.
postfix from version 2.0 should return a user unknown error to the sender automatically if the recipient doesn't exist.
Maybe you have sales and info in the aliases file. If a mail (sales@foo.bar) doesn't have a local recipient, but it is still being delivered, which mailbox is it being delivered to?
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