Re: Delivery time expiration
- From: Tony Nelson <tonynelson@xxxxxxxxxxxxxxxxx>
- Date: Mon, 13 Feb 2006 15:14:06 -0500
At 5:10 AM +1030 2/13/06, Tim wrote:
On Sun, 2006-02-12 at 16:15 +0100, Antonio Montagnani wrote:
Why sometimes do I receive this message from my ISP's mail server
related to some e-mail to fedora-list and the e-mail is not
delivered??
It happens only with fedora-list
Specifically, I think you get it with the Fedora list because of one of
it's anti-spam techniques (grey listing): Rejecting some mail, for the
moment, for it to be re-sent in a while. Normal mail servers will do
that, spammers won't.
In general, it means that the mail couldn't be delivered at that time,
for one reason or another (e.g. the server was too busy, the in box was
full, etc.), and that it should be sent again, a while later. After
some time of being unable to send a message, and probably after a
certain number of attempts, the mail server would declare it to be
undeliverable. It appears that yours doesn't have enough patience.
This can happen with greylisting if your MSP has multiple outgoing servers
and uses a different one for each try. Each time it will get a new
greylisting, and none of the attempts will succeed the first time. If
there are enough outgoing servers, then the message may time out before
getting back to a server that already attempted the message (and would pass
greylisting this time).
I wonder if greylisting pays any attention to MX records? (I just don't
wonder enough to look for myself.)
____________________________________________________________________
TonyN.:' <mailto:tonynelson@xxxxxxxxxxxxxxxxx>
' <http://www.georgeanelson.com/>
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