Yahoo! Mail Issue

Nathanael C. Cariaga nccariaga at stluke.com.ph
Tue Apr 12 02:12:29 CDT 2011


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 at 2mbit.com>   wrote:
>>>> On 4/11/11 10:47 PM, Matthew Petach wrote:
>>>>> mpetach at 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 at 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 at stluke.com.ph




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