A comma separated list of addresses for blind carbon copies (optional).
def get_b_cc() -> str: ... def set_b_cc(value: str) -> None: ...
b_cc = property(get_b_cc, set_b_cc)
This property specifies a comma separated list of destinations for blind carbon copies of the mail message. A copy of the message is sent to each destination, but no BCc SMTP header is created containing the destination addresses, so individual recipients never see the list of the other recipients.
The class will return an error if the mail_server returns an error code about any email address specified in send_to or cc but it will only fire an on_error event if the same happens with an email address specified in this property.
If the resulting header is longer than MaxHeaderLength, then it is folded according to RFC 822 specifications.
NOTE: You must clear the message_recipients properties before setting this property to remove previous recipients.