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Old 06-22-2003, 05:07 AM   #1
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Registered: Jun 2003
Location: Hong Kong
Distribution: Redhat
Posts: 3

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Question qmail server with broadband problem

I build a qmail server under a ADSL broadband following the instruction in "Life with qmail".

I don't have a fix IP, so I use a no-ip host name so the server is "" and I create an account "".
I can receive mail from all the world and I can send mail to myself ( send to
but when I send mail to other host (e.g., "", the mail stay in the queue forever and the log said "deferral: Sorry,_I_wasn't_able_to_establish_an_SMTP_connection._(#4.4.1)/"

I read the some post here and found somebody said most ISP have blocked the port 25.(do I correct?)
What should I do to make my qmail server able to send mail to other host?

Thank you very much for your support
Old 06-22-2003, 06:39 AM   #2
Registered: May 2003
Location: A country town, Australia
Distribution: Debian
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Hmm, is it common for ISPs to block outgoing SMTP? Mine doesn't.

You can make a quick check with telnet to see if sending to port 25 is blocked. First, find a mailserver: if you want to test against hotmail,

$ host -t mx

This gives a list of hotmail's servers for incoming SMTP. Pick any one... type this, don't forget 25 on the end:

$ telnet 25

I get the following (not blocked):

Connected to
220 Microsoft ESMTP MAIL Service,
.. etc etc

Then type quit, enter to exit.

If it just times out, or says something like "unreachable", try another mailserver or two... if they are all unreachable, odds are you have been firewalled somewhere.

If you are blocked, one solution would be to make qmail send everything outgoing via your ISP's mailserver. Look at smtproute in "man qmailremote".
Old 06-22-2003, 08:14 AM   #3
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Registered: Jun 2003
Location: Hong Kong
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Thank you soob,

I have tried telnet-ing a few mail servers and all got time out, except my ISP's mail server. I think I got blocked.

I will take a look about smtproute, Thank you very much soob


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