Dave Crocker <dhc(_at_)dcrocker(_dot_)net> writes:
Didn't see any length recommendations for Message-ID, in RFC2821.
What do folks suggest for the largest maximum size of the left-hand
field of a message-id (id-left)?
The NNTP standards impose a maximum length of 250 characters for the
complete message ID when used in a Usenet article, so that may be a
reasonable upper guideline if there are no other more pressing
considerations, just for convenience of gatewaying.
--
Russ Allbery (rra(_at_)stanford(_dot_)edu)
<http://www.eyrie.org/~eagle/>