Re: [Sqlgrey-users] Backup MX servers

[Lionel B. <lio...@bo...>]

Ray Booysen wrote the following on 16.06.2005 09:58 :

> Unfortunately I don't have control over any secondaries.  Anyone know
> of a host that will sell me secondary services and implement
> greylisting? :)


The fact is: you probably don't need a secondary MX (in fact no sane
configuration should). SMTP guarantees that the sending host will retry
a failed transaction latter without the message originator even noticing
this (unless the message is delayed for long and the MTA is configured
to warn when a message is delayed for more than a specified amount of
time).So if your primary goes down, either you put it back before the
messages expire in their queues and your users get them or you aren't
quick enough and whatever the case the messages will be bounced back
from the queue they are sitting in (either the origin MTA or the
secondary MX).

Simply remove the secondary MX from the DNS config and when the TTL
expires remove it from your trusted sources in your local Postfix
configuration.

Lionel.