Re: Last Call: On-Demand Mail Relay (ODMR) to Proposed Standard

[Randy Bush <randy@xxxxxxx>]

    [ABNF] for ATRN:
    atrn          = "ATRN" [domain *("," domain)]
    domain        = sub-domain 1*("." sub-domain)
    sub-domain    = (ALPHA / DIGIT) *(ldh-str)
    ldh-str       = *(ALPHA / DIGIT / "-") (ALPHA / DIGIT)

this precludes use of this protocol to pick up mail for perfectly valid
domains, e.g. feen_bar.foo, let alone much more interesting cases with
which i could make you ill.  or, to be more politically correct, for
domain names not representable in 7-bit ascii, such as göran.com.

see rfc 2181 sec 11.

randy