[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)

[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]

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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Re: [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)

[Enrico Weigelt]

* Stroller <stroller@stellar.eclipse.co.uk> wrote:

Hi,

<snip>
> 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)

maybe he only accepts only authenticated users to relay ?

> 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. 

Please do not mix up (outgoing) relay of some provider and (incoming) MX
for some domain. They're completely different things (which only *may* 
point to the same host). 

> 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.

Doesn't postfix have some feature like sendmail's mailertable ?

> 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

<snip>

>   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:

yeah, postfix gets confused by the "." MX reference for the domain 
smtp1.mail.vip.ukl.yahoo.com. Although it is an unclean configuration, 
I do not see what this has to do with your relay ... your postfix
just has to pull its mails (for yahoo.co.uk) to smtp.mail.yahoo.co.uk,
and it has an proper A record, so what does it need the MX record for ?


BTW: if you don't get it fixed, you may get an UUCP account for 
relay at my site.


cu
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Re: [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]

On 28 Jun 2006, at 21:58, Enrico Weigelt wrote:
>> ...
>> <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)
>
> maybe he only accepts only authenticated users to relay ?

There's a link on the webpage which explains the reason - apparently  
they would only accept messages with a From: address like  
user@stroller.uk.eu.org from my host. Anything which I've addressed  
from@yahoo.com has to reach them via yahoo.com's servers.

>> 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.
>
> Please do not mix up (outgoing) relay of some provider and  
> (incoming) MX
> for some domain. They're completely different things (which only *may*
> point to the same host).

Sorry... I'm not sure that I understand.

My Yahoo account allows me to use their servers for outgoing STMP.  
This is what I'm trying to configure Postfix to do.

> Doesn't postfix have some feature like sendmail's mailertable ?

Yes. On Googling "mailertable" I am able to tell you that this  
appears to be exactly the same as /etc/postfix/transport

So:
   $ cat /etc/postfix/transport
   lsv.uky.edu     :smtp.mail.yahoo.co.uk
tells my server that anything going to lsv.uky.edu should relay via  
my outgoing SMTP account at smtp.mail.yahoo.co.uk. This is a _little_  
clumsy for my purposes, but adequate.

>>   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:
>
> yeah, postfix gets confused by the "." MX reference for the domain
> smtp1.mail.vip.ukl.yahoo.com. Although it is an unclean configuration,
> I do not see what this has to do with your relay ... your postfix
> just has to pull its mails (for yahoo.co.uk) to smtp.mail.yahoo.co.uk,
> and it has an proper A record, so what does it need the MX record  
> for ?

Ah, looking up <http://www.mob.net/~ted/tools/mx.php3? 
domain=smtp.mail.yahoo.co.uk> I see what you mean.

I don't see why postfix is looking up the MX record for it, either.  :(

My immediate reaction is: what if I host a fake MX record for  
smtp.mail.yahoo.co.uk on my internal DNS? I'm not sure of the  
implications of that.

> BTW: if you don't get it fixed, you may get an UUCP account for
> relay at my site.

I think this would only satisfy mg1.uky.edu if you yourself relayed  
anything to its domain via Yahoo. And for that you would require an  
SMTP account with Yahoo.

Stroller.

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Re: [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)

[Enrico Weigelt]

* Stroller <stroller@stellar.eclipse.co.uk> wrote:

Hi,

> >
> >maybe he only accepts only authenticated users to relay ?
> 
> There's a link on the webpage which explains the reason - apparently  
> they would only accept messages with a From: address like  
> user@stroller.uk.eu.org from my host. Anything which I've addressed  
> from@yahoo.com has to reach them via yahoo.com's servers.


Yeah, one server is for relaying traffic with @... *sender*, and 
another is for incoming traffic *to the @yahoo.com domain.
They're separate, one doesn't accept the stuff for another.

<snip>

> >Doesn't postfix have some feature like sendmail's mailertable ?
> 
> Yes. On Googling "mailertable" I am able to tell you that this  
> appears to be exactly the same as /etc/postfix/transport
> 
> So:
>   $ cat /etc/postfix/transport
>   lsv.uky.edu     :smtp.mail.yahoo.co.uk
> tells my server that anything going to lsv.uky.edu should relay via  
> my outgoing SMTP account at smtp.mail.yahoo.co.uk. This is a _little_  
> clumsy for my purposes, but adequate.

hmm, looks okay for now. 
Did you authenticate propery @smtp.mail.yahoo.co.uk ?

<snip>

> >yeah, postfix gets confused by the "." MX reference for the domain
> >smtp1.mail.vip.ukl.yahoo.com. Although it is an unclean configuration,
> >I do not see what this has to do with your relay ... your postfix
> >just has to pull its mails (for yahoo.co.uk) to smtp.mail.yahoo.co.uk,
> >and it has an proper A record, so what does it need the MX record  
> >for ?
> 
> Ah, looking up <http://www.mob.net/~ted/tools/mx.php3? 
> domain=smtp.mail.yahoo.co.uk> I see what you mean.
> 
> I don't see why postfix is looking up the MX record for it, either.  :(

Maybe he's paranoid ?

> My immediate reaction is: what if I host a fake MX record for  
> smtp.mail.yahoo.co.uk on my internal DNS? I'm not sure of the  
> implications of that.

hmm, you could hava a try.
 
> >BTW: if you don't get it fixed, you may get an UUCP account for
> >relay at my site.
> 
> I think this would only satisfy mg1.uky.edu if you yourself relayed  
> anything to its domain via Yahoo. And for that you would require an  
> SMTP account with Yahoo.

My relays push the mails to the MX'es defined in the domains.
Maybe I missed the point, but I don't see why this shouldn't work.


cu
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Re: [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]

On 30 Jun 2006, at 15:23, Enrico Weigelt wrote:
>
> Yeah, one server is for relaying traffic with @... *sender*, and
> another is for incoming traffic *to the @yahoo.com domain.
> They're separate, one doesn't accept the stuff for another.

Well, duh!

Excuse me for not explaining myself properly.
But I don't know how to explain myself better.

> Did you authenticate propery @smtp.mail.yahoo.co.uk ?

I believe so. There's nothing in the logs to indicate that I haven't,  
and the user:pass in /etc/postfix/sasl_passwd is correct,

>> I don't see why postfix is looking up the MX record for it,  
>> either.  :(
>
> Maybe he's paranoid ?

Uh, but this seems to be postfix on MY box (compaq.stroller.uk.eu.org)

>>> BTW: if you don't get it fixed, you may get an UUCP account for
>>> relay at my site.
>>
>> I think this would only satisfy mg1.uky.edu if you yourself relayed
>> anything to its domain via Yahoo. And for that you would require an
>> SMTP account with Yahoo.
>
> My relays push the mails to the MX'es defined in the domains.
> Maybe I missed the point, but I don't see why this shouldn't work.

My box normally pushes to the MX defined for the domain, too, but  
mg1.uky.edu will reject SMTP deliveries for any message with a From:  
address where the domain doesn't match the sending machine. As I have  
already explained.

Stroller.


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Re: [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)

[Enrico Weigelt]

* Stroller <stroller@stellar.eclipse.co.uk> wrote:

Hi,

> >Did you authenticate propery @smtp.mail.yahoo.co.uk ?
> 
> I believe so. There's nothing in the logs to indicate that I haven't,  
> and the user:pass in /etc/postfix/sasl_passwd is correct,

Is there any note that it even tried to authenticate ?

<snip>

> >>I think this would only satisfy mg1.uky.edu if you yourself relayed
> >>anything to its domain via Yahoo. And for that you would require an
> >>SMTP account with Yahoo.
> >
> >My relays push the mails to the MX'es defined in the domains.
> >Maybe I missed the point, but I don't see why this shouldn't work.
> 
> My box normally pushes to the MX defined for the domain, too, but  
> mg1.uky.edu will reject SMTP deliveries for any message with a From:  
> address where the domain doesn't match the sending machine. As I have  
> already explained.

Stupid configuration, since the admin expects MX and relay to be 
the same, which is a very bad assumption, but well, let's give it 
to him: relay through another box, which rewrites the headers of
the mails to this bogous mx.

AFAIK, sendmail's genericstable can help here:
Mask the from dependent on the destination.


cu
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Re: [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)

[kashani]

Stroller wrote:

>> Did you authenticate propery @smtp.mail.yahoo.co.uk ?
> 
> I believe so. There's nothing in the logs to indicate that I haven't, 
> and the user:pass in /etc/postfix/sasl_passwd is correct,
>

In my case I noticed that sasl auth on relay doesn't seem to work unless 
I set the following in main.cf

smtpd_sasl_auth_enable = no
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes

it's the smtp_sasl_auth_enable = yes line that is the most important.

kashani
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Re: [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)

[Enrico Weigelt]

* kashani <kashani-list@badapple.net> wrote:

<snip>

> In my case I noticed that sasl auth on relay doesn't seem to work unless 
> I set the following in main.cf
> 
> smtpd_sasl_auth_enable = no
   ^^^^^^^^^^^^^^^^^^^^^^^^^
Are you sure you have to *disable* sasl auth on your (incoming)
smtp server ?

<snip>
 
> it's the smtp_sasl_auth_enable = yes line that is the most important.

Of course. You have to tell him that he should (try to) 
authenticate itself at another server.


cu
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Re: [gentoo-user] Anyone using Yahoo as Postfix relay?

[kashani]

Enrico Weigelt wrote:
> * kashani <kashani-list@badapple.net> wrote:
> 
> <snip>
> 
>> In my case I noticed that sasl auth on relay doesn't seem to work unless 
>> I set the following in main.cf
>>
>> smtpd_sasl_auth_enable = no
>    ^^^^^^^^^^^^^^^^^^^^^^^^^
> Are you sure you have to *disable* sasl auth on your (incoming)
> smtp server ?

With more than one admin here it's easy to mistake smtp for smtpd. 
Additionally I believe is explicitly turning off things I don't need so 
they don't come back to bite me in the ass when the default settings of 
a daemon changes eight months down the line. If you need sasl on 
incoming mail then by all means leave it on.

>  
>> it's the smtp_sasl_auth_enable = yes line that is the most important.
> 
> Of course. You have to tell him that he should (try to) 
> authenticate itself at another server.

Hard to auth when you're not telling Postfix it needs to with the 
smtp_sasl = yes line. At least that hasn't been mentioned in this thread 
  so I thought it was worth the mention.

Going back to the original problem you won't see sasl auth in the logs 
unless you add a -v to smtp is master.cf, again not smtpd which is the 
first line in master.cf, but smtp. I'd flip it on while you're 
troubleshooting.

kashani
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