On Saturday, 28 December 2002 at 22:32:30 +0000, lewiz wrote:
> On Sat, Dec 28, 2002 at 08:53:15AM -0500, Harry Tabak wrote:
>> Mail sent from my main server, gatehouse.quadtelecom.com (
>> gets rejected.
>>   _450_Client_host_rejected:_cannot_find_your_hostname,_[]
> I'm getting this all the time too.  It seems that after a while my mails
> just get through anyway.  In fact, just now they've been getting through
> first time.  I'm sure my DNS is all messed up but it seems odd it gets
> through after a few retries -- is that part of the filter?  If it's
> persistent, let it in?

No, this means that your DNS is flaky.  As somebody observed, this is
a transient error.  Your MTA retries about every 30 minutes for about
5 days, and sooner or later the reverse lookup succeeds, and your mail
is delivered.

> Does anybody know when this was implemented?

It's been around for some years.

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