# Functions
EnforceFrom ensures that all outgoing mail comes from the correct FROM while preserving intent in the Reply-To.
MessageToBytes converts a Message to a set of bytes ready for delivery.
# Constants
HeaderFrom is used to identify the From header for an email.
HeaderReplyTo is used to identify the Reply-To header for an email.
HeaderSender is used to identify the Sender header for an email.
HeaderTo is used to identify the To header for an email.