Hello All,
I have a customer who uses linux (RH9) and sendmail as outgoing SMTP server.
There is a strange problem. SMTP server delivers e-mails everywhere around the world except the domains in China. Most of times sendmail gives errors that "lookup failed" and returns e-mails after 5 days of trying.
These are domains hosted in China.
Sometimes delivery succeeds when I do: sendmail -v -q
For some domains it states "invalid sender xyz@vsnl.net" and keeps trying for 5days.
I tried with local DNS as well as ISP (iqara) DNS. But problem exists with both.
On Googleing I found someone having same problem way back in 2001 but there was no solution. Also I found there is lots of control by Chinese government.
Is this problem with RH9? or sendmail with RH9? But then why does problem occur only with China?
So please let me know if someone has (had) same problem and solution if it was solved.
Thanks in advance.
Amish.
P.S. OT question: anyone know if iqara provides SMTP server?
On Thursday 13 July 2006 12:22, Amish Mehta wrote: *snip*
On Googleing I found someone having same problem way back in 2001 but there was no solution. Also I found there is lots of control by Chinese government.
Is this problem with RH9? or sendmail with RH9? But then why does problem occur only with China?
So please let me know if someone has (had) same problem and solution if it was solved.
Umm...he needn't use Sendmail as his outgoing SMTP. He can use his provider's SMTP server. The problem shouldn't be with RH9 since is a very well tested, stable distro and still is being used commercially. If there is such a bug then it should be reported on Redhat's bugzilla but it seems highly unlikely.
I dont think the great firewall of China has anything to do with it. AFAIK, if the reverse look up on your IP fails then your mail isn't accepted by the target's SMTP server. I guess this must be your problem because I dont think your customer has bought a domain name and a static IP...
On Thu, 2006-07-13 at 12:22 +0530, Amish Mehta wrote:
Hello All,
I have a customer who uses linux (RH9) and sendmail as outgoing SMTP server.
There is a strange problem. SMTP server delivers e-mails everywhere around the world except the domains in China. Most of times sendmail gives errors that "lookup failed" and returns e-mails after 5 days of trying.
The NS machines must be down/unreachable or the NS entries @ the Domain registrar may not be up to date. Have you tried to resolve MX record manually?
These are domains hosted in China.
Sometimes delivery succeeds when I do: sendmail -v -q
For some domains it states "invalid sender xyz@vsnl.net" and keeps trying for 5days.
I know you are using sendmail but ... Are you trying to send the messages directly from your own SMTP server i.s.o. of the ISP's SMTP relay (smart host)? If so, the receiving MTAs may be configured to reject messages from IPs that do not match with vsnl.net's SMTP host(s).
but there was no solution. Also I found there is lots of control by Chinese government.
Very likely, this is the problem.
Is this problem with RH9? or sendmail with RH9? But then why does problem occur only with China?
I don't think so. Otherwise, you would have not been able to exchange messages with domains elsewhere in the world.
P.S. OT question: anyone know if iqara provides SMTP server?
Yes. Pls. look thru their website or call their CC.
-- Arun Khan (knura at yahoo dot com) Chisolm's First Corollary to Murphy's Second Law: When things just can't possibly get any worse, they will.
On 13-Jul-06, at 12:22 PM, Amish Mehta wrote:
Is this problem with RH9? or sendmail with RH9? But then why does problem occur only with China?
some years back i used to face this problem with fsnet.co.uk - overloaded network? All pipes into china monitored so traffic clogged?
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Amish Mehta -
Arun K. Khan -
Dinesh Joshi -
Kenneth Gonsalves