Common Local-part Semantics
According to RFC 5321 2.3.11 Mailbox and Address, "...the local-part MUST be interpreted and assigned semantics only by the host specified in the domain part of the address.". This means that no assumptions can be made about the meaning of the local-part of another mail server. It is entirely up to the configuration of the mail server.
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“Our passions do not live apart in locked chambers but dress in their small wardrobe of notions, bring their provisions to a common table and mess together, feeding out of the common store according to their appetite.”
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