On Oct 8, 2005, at 9:16 AM, Pribadi Kardono wrote:
Hi all,
I am using my qmailtoaster mostly as mailing list server. My
question, is there anyway to have a back up mx that will continue
to send/distribute the emails to the list whenever the main server
down.
Currently I have one primary mail server and one backup mail
server with setting mx on DNS are 10 for the backup. But seems the
backup server never take over the primary to distribute the email
while the main down.
Is there anyway that I have to setup to make it works? Your help
would be great full and appreciated.
that's not how backup MX typically works. normally a backup MX
*accepts* mail for the domain when the primary MX is down, then holds
the mail until the primary MX comes back up, whereupon it forwards
the mail on to the primary MX. if you want the backup MX to send out
the mail to the list recipients, then you need to duplicate the list
configuration (i.e. create a mailing list on the backup MX, with the
same addresses subscribed). when someone subscribes or unsubscribes
from the main list, you'll need some way to propagate the changes
over to the backup MX. off the top of my head i can't think of an
easy way to do that.
if you want basic secondary MX setup, try something like the following.
changes you must make to the primary mail server:
1. you must tell your primary mail server (the qmailtoaster) to allow
mail relayed from the backup MX. to do this, edit /etc/tcprules.d/
tcp.smtp and add lines like this:
<ip address of your secondary MX>:allow
add one such line for each secondary MX; place them between the line
that starts with "127." and the line that starts with ":allow".
then run "qmailctl cdb" to apply your changes.
changes you must make to the DNS zone:
for each backup MX, add a MX record with a larger priority number
than your primary.
and finally, if you're administering the secondary mail server
instead of using somebody else's service, you must configure it to
accept mail for your domain(s), hold it for a reasonable length of
time (two weeks, perhaps?), and deliver it to the primary MX.
-steve
---
If this were played upon a stage now, I could condemn it as an
improbable fiction. - Fabian, Twelfth Night, III,v
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