[afnog] Problems Sending Mail to Yahoo

[Antonio Godinho]

I have noticed the same thing for many of my MTAs for a while now, I get 
lots of 421s in the mail queue, although they are eventually delivered, it 
takes quite a while. It mostly happens when you have mailing lists which 
have several subscribers from yahoo, it seems they have a limit as to how 
many messages can come from a single e-mail address at a time.

Cheers,

AG

On Thu, 10 Apr 2008 13:40:43 -0400, Joe Abley wrote
> On 10 Apr 2008, at 13:00 , Peter Nyamukusa wrote:
> 
> > I am just wondering if any of you are having issues sending email to  
> > yahoo
> > especially if you are an ISP. I noticed as of yesterday most of the  
> > mail to
> > yahoo is deferred and little trickles out at a snails pace. It seems  
> > a while
> > back they implemented some form of Grey-listing in order to help  
> > fight spam.
> > Any comments/feedback welcome
> 
> I've had similar problems with my personal mail servers.
> 
> The last time I looked, the URLs reported in the 421 messages from  
> Yahoo! MTAs didn't work (they redirected to generic support pages); 
> I  searched NANOG archives to find the right URLs, but even then it  
> wasn't obvious which of their various forms I was supposed to be 
>  filling out.
> 
> One of the reasons I ran into trouble (I think) was that I had some 
> e- mail aliases set up which expanded to lists of people, and some 
> of  those people had Y! accounts. When spam hit that alias and was 
>  forwarded, the Y! MTAs apparently assigned some portion of the  
> responsibility for the spam to my MTAs, which I guess is somewhat  
> reasonable since from the perspective of Yahoo! they probably looked 
>  like open relays.
> 
> I have been told that even if you take great care to correct 
> whatever  problem caused your server to be considered suspect, all 
> it takes is  two or more Y! mail users to press the "this is spam" 
> button on mail  sent through your server and you're back to square one.
> 
> The most recent thing I tried was reconfiguring the MTAs I use to  
> submit mail through so that they add DomainKeys headers to my 
> outbound  mail, and adding the corresponding records to the DNS for 
> the domains  concerned. This seems to have made things better, for now.
> 
> In case you want to try DomainKeys too, it turned out to be very 
> easy  to do with exim on FreeBSD. The following link has some useful 
>  information:
> 
>    http://wiki.exim.org/DomainKeys
> 
> Skip down to the heading "Yahoo DomainKeys for Exim + FreeBSD + bind 
>  name server howto" and read from there.
> 
> Joe
> 
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--
Antonio Godinho
B.Sc., MCP+I, MCSE, CCNA, CCNP
CIUEM
Maputo
Mozambique