Set the "bcc" header from the given parameter, which may be either
a single Address, or a list of several Addresses. To add further "bcc"
headers, use add_bcc.
Set the "cc" header from the given parameter, which may be either
a single Address, or a list of several Addresses. To add further "cc"
headers, use add_cc.
Set the "From" header from the given parameter, which may be either
a single Mailbox, or a list of several Mailboxes. To add further "From"
headers, use add_from.
Set the "Reply-To" header from the given parameter, which may be either
a single Address, or a list of several Addresses. To add further "Reply-To"
headers, use add_reply_to.
Set the "Resent-bcc" header from the given parameter, which may be either
a single Address, or a list of several Addresses. To add further "Resent-bcc"
headers, use add_resent_bcc.
Set the "Resent-cc" header from the given parameter, which may be either
a single Address, or a list of several Addresses. To add further "Resent-cc"
headers, use add_resent_cc.
Set the "Resent-From" header from the given parameter, which may be either
a single Mailbox, or a list of several Mailboxes. To add further "Resent-From"
headers, use add_resent_from.
Set the "Resent-To" header from the given parameter, which may be either
a single Address, or a list of several Addresses. To add further "Resent-To"
headers, use add_resent_to.
Set the "To" header from the given parameter, which may be either
a single Address, or a list of several Addresses. To add further "To"
headers, use add_to.