[gentoo-user] Anyone using Yahoo as Postfix relay? (Name service error for name=smtp1.mail.vip.ukl.yahoo.com type=MX: Malformed name server reply)

[Stroller <stroller@stellar.eclipse.co.uk>]

Hi there,

Has anyone here got a Postfix server set up to relay through Yahoo's  
SMTP service, please?

Normally when I send mail, postfix on the server under the stairs  
connects directly to the addressee's mailserver (normal SMTP then) or  
uses my ISP's mailserver as a relayhost. Until recently this  
configuration has depended upon my mood - if I see a delivery failure  
I muck about with things until I get it right, but from my desktop PC  
I have recently started using the server-under-the-stairs more  
frequently, so I am having to look more closely at its configuration  
when things go wrong.

In this case I am getting a bounce message from a mailing-list server  
that says:

<listserv@lsv.uky.edu>: host mg1.uky.edu[128.163.184.178] said: 554  
5.7.1 Mail
     from domain yahoo.co.uk not accepted from host  
compaq.stroller.uk.eu.org
     (213.152.39.90) - see http://www.uky.edu/email/ (in reply to  
RCPT TO
     command)

I want to sign up to this list using my @yahoo.co.uk address, you  
see, so the logical thing to do is have postfix deliver everything  
with a from address @yahoo.co.uk using yahoo's SMTP server as  
relayhost. I understand that this is at least a little bit of a pain  
<http://archives.neohapsis.com/archives/postfix/2004-08/0618.html> so  
for me it's easier to send everything going to lsv.uky.edu via Yahoo.

I had expected this to be easy enough. Yahoo tells me that my server  
settings are:
   Outgoing Mail Server (SMTP):   smtp.mail.yahoo.co.uk

So:
   $ cat /etc/postfix/transport
   lsv.uky.edu     :smtp.mail.yahoo.co.uk
   $ sudo cat /etc/postfix/sasl_passwd
   smtp.mail.yahoo.co.uk   my_yahoo_id:verysecret
   $ sudo postmap hash:/etc/postfix/sasl_passwd
   $ sudo postmap /etc/postfix/transport
   $ sudo /etc/init.d/postfix restart

I then send the subscription mail again & look at the logs:
   Jun 22 02:56:20 compaq postfix/smtpd[6213]: connect from unknown 
[192.168.1.103]
   Jun 22 02:56:20 compaq postfix/smtpd[6213]: 309B31263BB:  
client=unknown[192.168.1.103]
   Jun 22 02:56:20 compaq postfix/cleanup[6216]: 309B31263BB: message- 
id=<0CEB75CF-67BC-45FA-9B62-0DE7D2472775@yahoo.co.uk>
   Jun 22 02:56:20 compaq postfix/qmgr[6174]: 309B31263BB:  
from=<my_yahoo_id@yahoo.co.uk>, size=579, nrcpt=1 (queue active)
   Jun 22 02:56:20 compaq postfix/smtp[6217]: warning:  
valid_hostname: empty hostname
   Jun 22 02:56:20 compaq postfix/smtp[6217]: warning: malformed  
domain name in resource data of MX record for smtp.mail.yahoo.co.uk:
   Jun 22 02:56:20 compaq postfix/smtp[6217]: warning:  
valid_hostname: empty hostname
   Jun 22 02:56:20 compaq postfix/smtp[6217]: warning: malformed  
domain name in resource data of MX record for  
smtp1.mail.vip.ukl.yahoo.com:
   Jun 22 02:56:20 compaq postfix/smtp[6217]: 309B31263BB:  
to=<listserv@lsv.uky.edu>, relay=none, delay=0, status=deferred (Name  
service error for name=smtp1.mail.vip.ukl.yahoo.com type=MX:  
Malformed name server reply)

   $ postqueue -p
   -Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
   309B31263BB      579 Thu Jun 22 02:56:20  strolls_uk@yahoo.co.uk
   (Name service error for name=smtp1.mail.vip.ukl.yahoo.com type=MX:  
Malformed name server reply)
                                          listserv@lsv.uky.edu

I'd be very grateful for any illumination on this one. I'm actually  
using a somewhat dated release of Postfix but this software is mature  
enough that I'm inclined to blame my own configuration rather than a  
bug.

Thanks in advance for any suggestions,

Stroller.

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