Inherited from Serializable
Inherited by implicit conversion any2stringadd from
Sender to any2stringadd[Sender]
Inherited by implicit conversion StringFormat from
Sender to StringFormat[Sender]
Inherited by implicit conversion Ensuring from
Sender to Ensuring[Sender]
Inherited by implicit conversion ArrowAssoc from
Sender to ArrowAssoc[Sender]
RFC 5322 3.6.2:
if a secretary were to send a message for another person, the mailbox of the secretary would appear in the "Sender:" field and the mailbox of the actual author would appear in the "From:" field.