References:

References:

---

Reference to original message

RFC2822

The References: header is used by mail-reading programs to include a reference to the original message in replies. This header must have as its value a copy of the original Message-ID: header field:

 References: <[e-mail]> 

Notice that the message identifier is wrapped in angle brackets, which causes it to look like an address.

The References: header should never be declared in the configuration file.