[Standards-JIG] "JEP-0033: Extended Stanza Addressing" and email (RFC822)

Tijl Houtbeckers thoutbeckers at splendo.com
Sat Sep 4 04:10:13 UTC 2004

Currently I'm working on a project involving email and Jabber. This  
involves mapping email address headers to Jabber ones. The most logical  
solultion for this would ofcourse be JEP-0033, which starts out:

"A protocol that enables entities to include RFC822-style address headers  
for XMPP stanzas in order to specify multiple recipients or sub-addresses."

However JEP-0033 Explicitly forbids multiple "reply-to" adressess:

"4.6.4 Address type='replyto'

This is the address to which all replies are requested to be sent. Clients  
SHOULD respect this request unless an explicit override occurs. There MUST  
NOT be more than a single replyto, replyroom, or noreply on a stanza.  

For email however, this is perfectly allowed! Let's take a look at RFC822:


         This field provides a general  mechanism  for  indicating  any
         mailbox(es)  to which responses are to be sent. [...]"

Having multiple reply-to headers for an email isn't that rare either, you  
see it occasionally on SJIG itself for example. Is there any good reason  
that I missed for the JEP to explicitly forbid this?? It even adds later  

"7. Reply Handling

When replying to a message stanza that contains an extended address, the  
following rules apply:
If more than one replyto or replyroom address is specified (bad protocol),  
or if a noreply address is specified, a reply SHOULD NOT be generated.

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