Milter-greylist

At Sat, 28 Oct 2006 22:18:22 +0200,
manu@... wrote:
> 
> AIDA Shinra <shinra@...> wrote:
> 
> > http://www.j10n.org/files/milter-greylist-3.0rc6-dosfix.patch
> -email          {mailbox}"\@"{domainname}
> +domainliteral  "["([0-9.]+|IPv6:[0-9.:]+)"]"
> +email          {mailbox}"\@"({domainname}|{domainliteral})
> 
> That's a big change. I used the email definition from RFC822. There is
> no way to fix that without changing the email definition?

A possible workaround is to replace '[', ']' and ':' into '_'.

> > If we reject rare addresses like <(comment) "Quoted" @[1.2.3.4]>, it
> > can be fixed in simpler manner.
> 
> Is <(comment) "Quoted" @[1.2.3.4]> a valid address? 

Valid but RFC2822 reads:

  then the dot-atom form SHOULD be used and the
  quoted-string form SHOULD NOT be used. Comments and folding white
  space SHOULD NOT be used around the "@" in the addr-spec.

Therefore, we may assume that when a client includes comment or
quoted-string in MAIL FROM: or RCPT TO: the client will be a spammer.
In contrast, I can't find such a claim against domain-literal either
RFC2821 or RFC2822.