"Backup" MXs still have use if you like to do certain kinds of spam analysis... 
Or did.

Aloha,
Michael.
--
Sent from my Windows Phone
________________________________
From: Dave Warren<mailto:[email protected]>
Sent: ‎3/‎1/‎2015 11:15 PM
To: [email protected]<mailto:[email protected]>
Subject: Re: [mailop] Multiple mail server setup

On 2015-03-01 17:56, Rich Kulawiec wrote:
> On Sun, Mar 01, 2015 at 10:47:12PM -0000, John Levine wrote:
>> By the way, why do you have a backup MX?  [snip]
> He's right.  There's no reason for this anymore.   All MX's should
> be precisely equivalent in terms of their accepted email addresses
> and their anti-spam rulesets.  The primary tools of competent,
> professional system administrators are your friends here: use
> make, rsync, and friends to ensure that they're kept identical
> at all times...and use things like virtusertable entries to handle
> the internal plumbing necessary to route mail as needed.
>

While I agree, it may still be advantageous to have inbound email come
to one server over another, so it's not inherently wrong to consider one
a "backup", as long as the configuration is functionally similar.

But the traditional "just accept everything" backup, as a concept, needs
to go away.

--
Dave Warren
http://www.hireahit.com/
http://ca.linkedin.com/in/davejwarren



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