Derek,

On Mon, Apr 03, 2006 at 01:14:09AM -0400, Derek Battams wrote:
> Quoting Alain Fauconnet <[EMAIL PROTECTED]>:
> 
> > Hello Tim,
> >
> > On Sun, Apr 02, 2006 at 06:07:40PM -0700, Tim Watkins wrote:
> >> I'm trying to use postfix to send registration emails to new users.  
> >>  If  the server sends a mail to a smaller service (like roadrunner,  
> >>   sympatico, ISP's etc) the mails are delivered without an issue,   
> >> however  when sent to yahoo/hotmail the emails sit in the queue and  
> >>  time out  giving an error:
> >>
> >>   connect to mx4.mail.yahoo.com[66.218.86.254]: Connection timed out
> >>
(...)
> >>   I have a dynamic DNS domain, and I'm thinking it may be the root   
> >> of all  this evil, however, I was told that if I set the $Relayhost  
> >>  in the  postfix config, I wouldn't get the error connecting to    
> >> mx4.mail.yahoo.com, because it would relay off my ISP's smtp   
> >> server. I  have set the relayhost, but I'm still getting the error.
(...)
> > What
> > you're showing really looks like an IP connectivity issue to the SMTP
> > port. I've never heard anything like Yahoo and Hotmail blocking SMTP
> > connections at the IP level. Someone correct me if I'm wrong.
> >
> > I was tempted to reply "your ISP blocks outgoing SMTP to the Internet"
> > but then you mention that mail to many other domains is delivered
> > properly, so that must not be the case. Or would they block SMTP out
> > *only* to the "big guys"? That sounds unlikely.
> >
(...)

> Don't ask me why I even remembered this, but I did, which may help  
> you.  For some reason, the default postfix install on TSL 2.2 has a  
> separate transport defined for Yahoo, Hotmail, and AOL destinations:
> 
> [EMAIL PROTECTED] /etc/postfix$ grep bigandslow *
> master.cf:bigandslow unix       -       -       n       -       -       smtp
> master.cf.rpmnew:bigandslow unix        -       -       n       -       
>   -      smtp
> transport:# when sending mail tol.  "bigandslow" is defined in master.cf
> transport:aol.com               bigandslow:
> transport:yahoo.com     bigandslow:
> transport:hotmail.com   bigandslow:
> 
> I've never really paid attention to it (other than to notice it once  
> before) as it all seems to work fine for me, but my guess is that  
> these transport definitions may be bypassing your relay host  
> definition and therefore the reason you can't send mail to Hotmail or  
> Yahoo (and I suspect AOL would be the same).  You may want to  
> investigate these settings in postfix.

You're right. How could I forget this? I've been bitten by these silly
transport entries too. Putting these in a distribution aiming at
solidity like Trustix is a major goof IMHO. They're pointless, mostly
undocumented, obviously do not apply to many situations (like when
using a relayhost!), they create confusion. I'd create a bug entry if
the Trustix Bugzilla weren't as completely unattended for as it seems
to be now :-(

Greets,
_Alain_
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