Re: Yahoo! Mail Issue

["Nathanael C. Cariaga" <nccariaga () stluke com ph>]

Strangely though I noticed that the email accounts that seems to be 
affected by our concern seems to be related to the Yahoo SG servers.....

On 4/12/2011 3:04 PM, Christopher Balmain wrote:
> We had a lot of issues delivering mail to yahoo.com.sg about a year ago
> (just the .sg domain, plain .com was fine). Could establish connection
> but it'd die halfway through transferring mail. A static route to drop
> the MTU (for their subnet only) to 1000 fixed the problem right up.
>
> Not sure if pmtud was/is broken or what.
>
> - Chris
>
> On Tue, 2011-04-12 at 15:29 +1000, Nathanael C. Cariaga wrote:
> > Thanks anyway.  I just find this issue intriguing since not all Yahoo
> > mail accounts are affected.  In addition, incoming mails from other
> > domain doesn't seem to be affected.  That is why I want to check if it
> > is a network issue :)
> >
> > -nathan
> >
> > On 4/12/2011 1:17 PM, Matthew Petach wrote:
> > > On Mon, Apr 11, 2011 at 9:54 PM, Brielle Bruns<bruns () 2mbit com>   wrote:
> > > > On 4/11/11 10:47 PM, Matthew Petach wrote:
> > > > > mpetach@opstools1:~>     telnet 219.90.94.56 25
> > > > > Trying 219.90.94.56...
> > > > > Connected to static-host-219-90-94-56.tri.ph.
> > > > > Escape character is '^]'.
> > > > > ehlo yahoo.com
> > > > > 554 SMTP synchronization error
> > > > > Connection closed by foreign host.
> > > > > mpetach@opstools1:~>
> > > > >
> > > > >
> > > > > I imagine when port 25 stops giving 5xx
> > > > > failure message back, mail reception
> > > > > might improve.   ^_^;
> > > >
> > > >
> > > > Works fine for me, your getting an error because your trying to send a
> > > > command before receiving the first 220, aka RFC violation.  As long as you
> > > > connect, wait a moment without trying to send a command, your fine.
> > >
> > > Doh!
> > >
> > > See, that's what happens when you ask networking people
> > > to try to troubleshoot mail issues.  ^_^;;
> > >
> > > Sorry about that.  :(
> > >
> > > Matt

--
Nathanael C. Cariaga
Network & Security Administrator
St Luke's Medical Center

Tel (QC) :  +63 2 723 0101 ext 5520 / 4206
Tel (GC) :  +63 2 789 7700 ext 6035 / 6036
Tel      :  +63 2 356 5686
Mobile   :  +63 922 8735686
EMail    :  nccariaga () stluke com ph