Thegeswini S:
> Could some one help on below request ?
>
> On Thu, Apr 16, 2015 at 1:02 PM, Thegeswini S <thegesw...@gmail.com> wrote:
>
> >
> > Presently we use primary MTA as Postfix for outbound mail server and we
> > were not configured inbound mails as we don;t have POP server in our env.
> >
> > The mail server resides on primary site and all the application servers
> > including DR sites servers, uses this mail server as relay system and send
> > mails to ISP...
> >
> > Now the requirement is to create an secondary outbound mail server on DR
> > site, incase of Primay server or site is down. I would like to know any
> > solution sending messages from backup outbound when primary is down ?
If you mean: have systems on your corporate network send external
email through the backup outbound mail server when the primary
outbound mail server is down, then I recommend that you use DNS MX
records, with the most-preferred records resolving to the primary
mail server, and with the less-preferred records resolving to the
secondary mail server.
If your infrastructure does not use DNS MX records internally, then
you can use A records instead, but then you have no "preference"
feature.
Otherwise, you need to find a solution that provides similar
functionality. For example, a number of strategically-placed
proxy servers (HAproxy, nginx) that direct clients to the "best"
MTA.
Wietse
