Resent fields SHOULD be added to any message that is reintroduced by
a user into the transport system. A separate set of resent fields
SHOULD be added each time this is done.
For instance, the "Resent-Message-ID:" field corresponds to
the "Message-ID:" field
This member is added by an implicit conversion from Resent-Message-ID to
any2stringadd[Resent-Message-ID] performed by method any2stringadd in scala.Predef.
This member is added by an implicit conversion from Resent-Message-ID to
StringFormat[Resent-Message-ID] performed by method StringFormat in scala.Predef.
RFC 5322 3.6.6:
Resent fields SHOULD be added to any message that is reintroduced by a user into the transport system. A separate set of resent fields SHOULD be added each time this is done.
For instance, the "Resent-Message-ID:" field corresponds to the "Message-ID:" field