On Tue, Sep 29, 2015 at 09:13:48AM +0200, Zalezny Niezalezny wrote:
> one of my team colleagues decided to configure multiple SMTP gateways for a
> single domain.
>
> domain.com
>
> MX
> 10 gate1-1.com(primary MX)
> 10 gate1-2.com(second primary MX)
> 30 gate2-1.com(backup MX)
> 30 gate2-2.com(backup MX)
> 60 gate3-1.com(backup MX)
> 60 gate3-2.com(backup MX)
>
> domain.com - gate1
> domain2.com - gate2
> domain3.com - gate3
>
> If SMTP server on one domain will not be available, then client will use
> another one.
This is fine, provided the backup MX hosts are properly configured
to accept and relay the mail to the gate-1 primary MX hosts, *and*
have working recipient validation (don't accept and then bounce mail
for non-existent recipients).
> I`m sceptic about this because my team has access only on to gate1 and in
> case of problems (eventual bounce) it will be hard to analyse the problem.
> Does it make sense ?
The configuration is fine, if implemented correctly, otherwise
remove the backup MX hosts, two primaries are typically enough,
unless you're concerned about losing network connectivity for both
for a prolonged span of time (and the backup MX hosts will queue
mail long enough to ride out the outage).
--
Viktor.
