Mail: POP3 UIDL, NNTP xhdr and threads

Hi all, the nntp.r script of the library (the one that came with some of the older /core distributions) gives a dialect to handle, where possible, the xhdr nntp optional command. Something similar (and similarly optional) is the pop3 uidl command, is someone out there able to use it with REBOL? Last but not least, how can I recognize the mail and news threads? News have message IDs, but I don't know how they are used while about mail I don't have any information. Anyone knowing which are the rules for threading and/or how are handled the messages on this mailing list to get threaded? Thank you and best regards Mario ============================================================ Mario Cassani PGP Key fingerprint: 9929 74CF 62E9 A7A4 60D6 05DC 8034 F354