kbajwa <kbajwa@tibonline.net> wrote:
>
> We use qmail as our email application. For the last month or so, we are
> having problem with SMTP server. It seems that it available some times and
> then not available other time.
>
> For example, this morning, I tested sending the emails with success. Five
> minutes later, I did another test and got the following error message:
>
> Task 'kbajwa@tibonline.net - Sending' reported error (0x80042109) : 'Outlook
> is unable to connect to your outgoing (SMTP) e-mail server. If you continue
> to receive this message, contact your server administrator or Internet
> service provider (ISP).'
Outlook is not useful as a debugging tool. When you're having problems, try
testing availability with a lower-level network connection tool like
tcpclient, or even telnet.
> I have checked both 'send' and 'smtpd' error logs with no error logs. I know
> that if SMTP server is not accessible, there will be no error log but I
> thought that I mention.
You should be checking the tcpserver logs for the smtp service. They'll show
you, for instance, whether all available/configured connection slots were
already in use at the time.
> I also thought that maybe DNS server is not resolving the IP addresses but I
> can ping the SMTP server and the IP addresses are being resolved.
`ping` is not a DNS diagnostic tool. Use dnsq and dnsqr (and dnstrace) for
testing DNS problems.
Charles
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