On Thu, 2007-01-18 at 08:55 -0800, Kirti Bajwa wrote:
> Hello List:
>
> Recently our SMTP server was flodded with double bounces. The SMTP
> server was so busy that our local clients could not sent any ougoing
> emails.
>
> Once person on qmail list suggested that we set up a 2nd instance of
> SMTPD and use it to send outgoing emails. We setup the 2nd instance of
> SMTPD as follows:
>
> SMTPD IP: 12.21.237.6 Port 25 (all incoming mail)
> SMTPD2 IP: 12.21.237.7 Port 587 (all outgoinging mail
> fromlocaldial-in clients)
>
> Then it was suggested that we have to tell all our local dial-in
> clients to use the new port 587 to send outgoing email.It is not
> possible tocontact 300+ users to change their port in Outlook Express
> to 587.
>
> Now another technician has suggested that we change our ZONE data to
> route the outgoing email. The poster said that it could be
> accompolished by adding one line to ZONE data!! We are working on
> alive machine and previous attemts have been unsuccessful. Following
> is a list of our ZONE data. I appreciate if someone can add one line
> toshow what change is needed:
This is not prossible with DNS but why don't you use your firewall
eg
iptables -t nat -A PREROUTING -p tcp -i ${SMTPD2 network card name eg.
eth0} --dport 25 -j DNAT --to-destination 127.0.0.1:587
and don't forget to first read your man iptables
--
With kind regards,
Maurice Lucas
TAOS-IT
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