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Re: Message-ID practical maximum size

2003-08-28 20:25:10


on 8/28/2003 9:03 PM Dave Crocker wrote:

BL> Note also that the maximum length of the domain part is 64 octets
per

yes, constraints on the right-hand side are pretty well established. 
that's why i only asked about the left-hand side.

The right-hand part of a message-id is *operationally* independent from
the envelope limits, since the message-id can refer to a host that doesn't
accept mail (and therefore doesn't need to use the addressing limits for
the domain name). So, the maximum size of the right-hand of the message-id
is the maximum size of a domain name, not the addressing limits.

My math is:

    998          one unfolded line
  -  12          "Message-ID: "
  -   3          "<" and "@" and ">"
  - 255          maximum domain name length (actually 254 but...)
 --------
  = 728 octets   safest maximum left-hand size


-- 
Eric A. Hall                                        http://www.ehsco.com/
Internet Core Protocols          http://www.oreilly.com/catalog/coreprot/


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