Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!vsi1!altnet!uunet!ksr!frapray!dudek
From: dudek@frapray.ksr.com (Glen Dudek)
Newsgroups: comp.mail.uucp
Subject: Re: Treatment of envelope recipient addresses (Was: Mail survey #1)
Message-ID: <386@ksr.UUCP>
Date: 3 Sep 88 17:11:44 GMT
References: <4740@b-tech.UUCP> <14177@comp.vuw.ac.nz>
Sender: nobody@ksr.UUCP
Reply-To: dudek@ksr.COM (Glen Dudek)
Organization: Kendall Square Research, Cambridge MA
Lines: 81

In article <14177@comp.vuw.ac.nz> duncan@comp.vuw.ac.nz (Duncan McEwan) writes:
>
>When "edu-gateway" gets it the address will be "internet.edu!somesite!user"
>Once they have figured out that they are sending to internet.edu via SMTP over
>the Internet, they should convert the uucp route address to the Internet
>equivelent - ie "@internet.edu:user@somesite" (or if they follow rfc822 to the
>letter and don't allow unregistered sites as part of route addresses, perhaps
>"user%somesite@internet.edu").

I configured Harvard's sendmail.cf to create a route-addr style address
if 'somesite' was a domain-style sitename.

>
>The current behaviour of many UUCP <-> Internet gateways seems to be
>to make "internet.edu!somesite!user" into "somesite!user@internet.edu",

This is what Harvard's sendmail.cf does if 'somesite' is not domainized
(or is pseudo-domainized, as in 'somesite.UUCP').

>I think the behaviour I have described is practical to implement in sendmail
>(I don't know if this is true of other mailers like mmdf, or if they already
>behave in this way).  Have I missed something that makes it difficult?  Are
>there any UUCP <-> Internet gateways using sendmail that do behave this way? 
>

The rest of this is for you sendmail guru's out there who care.

Here are the relevant sections from Harvard's sendmail.cf...
NOTE that this is the way I left it in summer 1987 - it may have been
improved.

This code translates Internet route-addrs from '@a,@b:user@c' into
'user@c@b@a' in Ruleset 3.

    # handle route-addr (ARPA routing syntax)
    # in general, change @a,@b:user@c <=> user@c@b@a
    # prepare to focus
    #
    # KLUDGE - strip stupid uucp path from front of route-addrs - gd 8/6/87
    #  foo!@bar:user@gag <=> @bar:user@gag
    R$+!@$+:$+@$+		$:@$2:$3@$4
    # recognize route-addr
    R@$+			$:@$1<>
    # change @b,@c:user@d<@a> <=> @c:user@d<@b@a>
    R@$+,@$+:$+<$*>		@$2:$3<@$1$4>
    # change @a:user@b <=> user@b<@a>
    R@$+:$+<$*>			$2<@$1$3>
    # defocus, and treat as simple 'user@site' below
    R$+<$*>			$1$2

This code translates UUCP addresses directed at Internet hosts from
'foo.domain!uucp-host!user@internet.domain' into
'uucp-host!user@foo.domain@internet.domain'.

    #################################
    #  UUCP -> ARPA route-addr	#
    #################################
    S9
    # focus on first uucp address
    R$+!$+@$+			$:<!$1>$2@$3
    # if the first bang-host is arpa-style, turn it into an '@'
    R<!$+.$=A>$+@$+		$@$>9$3@$1.$2@$4
    # else simply return as mixed-mode
    R<!$+>$+@$+			$@$1!$2@$3

This code is from Ruleset 4, and invokes Ruleset 9 and then converts
addresses with multiple '@'s (e.g., 'foo!user@c@b@a') into Internet
route-addr syntax (e.g., '@a,@b:foo!user@c').

    # change mixed-mode '@' and '!' into route-addr if appropriate
    R$+!$+@$+			$:$>9$1!$2@$3

    # turn multiple-'@' to route-addr
    R$+@$+@$+			$:<:$1@$2>@$3
    R<:$*>@$+@$+		<@$2:$1>@$3
    R<:$*>@$+			$@@$2:$1
    R<@$*>@$+@$+		<@$2,@$1>@$3
    R<$*>@$+			$@@$2,$1

Glen Dudek
ex-postmaster@harvard.harvard.edu