Re: Problems receiving emails from china...

[Joe Shen <joe_hznm () yahoo com sg>]

Hi,

Is there similar problem existing with sending email
to email server inside china?  

 maybe you could check end-to-end delay and packet
loss rate. 

Another method, ask your customer to cut the
attachment to several parts and send them seperately. 


Joe




 --- Lou Laczo <llaczo () inetu net> wrote:   
> Hi all,
>
> I did a quick search of the archives and was unable
> to find any previous
> discussions relevant to this topic.
>
> One of our clients has been having problems
> receiving some legitmate
> emails from business associates in China. The
> client's mailserver is
> running qmail. In almost all of the cases, the
> failing email has at least
> one attachment and is larger than what might be
> considered "normal". Our
> client's mailserver receives part of the message and
> then the smtp
> connection hangs and eventyally times out. Many
> times, the sending mail
> server will attempt to send the message again and
> again before finally
> giving up. The failing messages can be successfully
> delivered to hotmail
> and/or yahoo accounts.
>
> I've observed this problem while it was occuring and
> there are multiple
> smtp connections open between the clients server and
> the sender's server.
> The connections are in various states, some
> established, some in fin_wait,
> etc. I've tried tracerouting to the sender's server
> and in every case I've
> observed the trace times are terrible. I've looked
> at various aspects of
> the mail server's configuration and all looks well
> there. I've even tried
> having the senders email to a totally different
> mailserver on our network
> and get similar failures. It's staring to look like
> this is just a simple
> case of bad network connectivity from the sender. My
> guess is that the big
> free email systems have relay servers all over the
> world, so the sender in
> China would be talking to a server much closer to
> home. This would explain
> why the mail can be successfully delivered to
> hotmail, yahoo, etc.
>
> Has anyone ever experienced a problem similar to
> this? Thanks in advance
> for your attention and any responses/help.
>
> --Lou.
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