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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“The most beautiful lives, to my mind, are those that conform to the common human pattern, with order, but without miracle and without eccentricity.”
—Michel de Montaigne (1533–1592)