On Fri, 18 Feb 2005, Maciej Soltysiak wrote: > Developers: Consider using checksum of the email messages, not only the > Message-ID to distinguish between duplicated messages. We have a product that needs to detect duplicate messages (retransmissions in the face of temporary SMTP failures.) Obviously, we'd never use the Message-ID for this. Less obviously, you can't always use a hash because some mailers actually change the message body on each retransmission! For example, Lotus Domino appears to store the e-mail in some internal format, and generates a new MIME message on each retransmission. Each generated message has different MIME boundary delimiters. So we have to calculate a "modified" hash and ignore bits of the message that mutate. -- David.
