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/>
