[Exim] Re: (no-spam) Sourceforge and IPv6 Hosts

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Author: Marc MERLIN
Date:  
To: Kevin Sindhu, exim-users
Subject: [Exim] Re: (no-spam) Sourceforge and IPv6 Hosts
[postmaster@??? Bcced]

On Wed, Dec 05, 2001 at 03:42:12PM -0800, Kevin Sindhu wrote:
> Resending as both exim-users@ and Marc's filter bounced it thinking
> its spam...
> [/me thinks it because of "sourceforge.net" in the subject line].


No, it's because marc_news is a post only address (as the name would imply),
and you can't send mail directly to it unless you are answering a post I
made. That said, there was no need to Cc me, I read postmaster@???

All that said, for sourceforge users, we ask if at all possible, that you
submit a support request on the sf.net web site.

It's also a bad idea to send this both to postmaster@??? and the exim
users list. All the posts are going to be blocked due to addresses not being
subscribed.

I've removed postmaster@sf from the Cc line.
If you want, you are welcome to continue on the exim list or with
postmaster@sf depending on whether you have exim questions or you are
service issues with sf.net

> Now this behavior may be valid for IPv4 hosts however the sending MTA
> (in this case leviathan.lucifer.at) has a valid AAAA pointer and a MX
> record. [Below]
>
> IMHO, the receiving MTA should also check if the sending host does
> have an AAAA record and not only an A record.


The exim and the OS on sf.net are not IPV6 fully aware.
They probably will be at some point, but they aren't yet.

That said, it should then fallback to your IPV4 MXes, and it seemed to when
I ran it in debug mode:

fully qualified name = leviathan.lucifer.at
host_find_bydns yield = HOST_FOUND (2); returned hosts:
  leviathan.lucifer.at 3ffe:1200:3028:8d6b:a00:20ff:fefd:5ba0 0 76 
  mail.open-systems.org 24.76.172.29 5 524 
  mail.greenseek.net 207.194.231.38 10 1047 
queued for remote_smtp transport: local_part=kevin domain=leviathan.lucifer.at
  errors_to=NULL
  domain_data=NULL local_part_data=NULL
routed by lookuphost router:
  deliver to kevin@???
  transport: remote_smtp
  host leviathan.lucifer.at [3ffe:1200:3028:8d6b:a00:20ff:fefd:5ba0] MX=0
  host mail.open-systems.org [24.76.172.29] MX=5
  host mail.greenseek.net [207.194.231.38] MX=10
usw-sf-sshgate.sourceforge.net 216.136.171.253 mx=-1 
host in sender_verify_hosts_callback? yes (*.valinux.com)
leviathan.lucifer.at in sender_verify_callback_domains? yes (matched *)
Attempting full verification using callback
Connecting to leviathan.lucifer.at [3ffe:1200:3028:8d6b:a00:20ff:fefd:5ba0.25] ... socket creation failed: Address family not supported by protocol
Connecting to mail.open-systems.org [24.76.172.29.25] ... connected
read response data: size=133
  SMTP<< 220-mail.open-systems.org ESMTP Exim 3.33 #324 Wed, 05 Dec 2001 16:18:19 -0800
         220-
         220 All Connections are Logged and Monitored

SMTP>> HELO usw-sf-list1.sourceforge.net

read response data: size=78
SMTP<< 250 mail.open-systems.org Hello usw-sf-fw2.sourceforge.net [216.136.171.252]
SMTP>> MAIL FROM:<>

read response data: size=33
SMTP<< 250 <> is syntactically correct
MAIL FROM: <> accepted, trying RCPT TO: <kevin@???>
SMTP>> RCPT TO:<kevin@???>

read response data: size=43
SMTP<< 250 <kevin@???> verified
RCPT TO: <kevin@???> accepted
Making sure that domain accepts mail for postmaster (sender_verify_callback_postmaster enabled)
SMTP>> RSET

read response data: size=14
SMTP<< 250 Reset OK
SMTP>> MAIL FROM:<>

read response data: size=33
SMTP<< 250 <> is syntactically correct
SMTP>> RCPT TO:<postmaster@???>

read response data: size=48
SMTP<< 250 <postmaster@???> verified
SMTP>> QUIT

kevin@??? verified ok as kevin@???
SMTP>> 250 <kevin@???> is syntactically correct


> Any comments?


I'd say that whatever issue was there when exim outputted this:

> (There was a temporary failure while looking up the hostname in DNS, it was
> unreachable, or the mail server(s) for that hostname is/are currently not
> responding and your address couldn't be verified. You may be using an internal
> hostname that's not reachable from the internet and if so, bounces can't reach
> you as a result. You should setup an MX record for it, or masquerade your
> domain to something that does accept mail from the internet. This failure is
> temporary)


is gone now:

Connected to usw-sf-lists.sourceforge.net.
Escape character is '^]'.
220 usw-sf-list1.sourceforge.net ESMTP Exim 3.31-VA-mm2 #1 Wed, 05 Dec 2001 16:18:07 -0800 - SF usw-list mm5
mail from: kevin@???
250 <kevin@???> is syntactically correct
rcpt to: myaccount@???
250 <myaccount@???> is syntactically correct
data
354 Enter message, ending with "." on a line by itself
From: kevin@???
To: myaccount@???

test