hi
tim wrote:
Hi Kristof,
(tried to send this an hour ago, but seems like it didn't get through. sorry if you receive it twice)
I have this too with pd-list, sometimes it takes more than an hour for my mail to appear.
hey guys, i hope you are aware that a mailing-list is an asynchronous medium. mails can take several hours to be delivered. this is _normal_ behaviour. just because emails often go through faster than that, does not mean that you should rely on that. after all, it's a complicated internet.
so if you are interested, where the delivery slows down, you should have a look at the email-headers. e.g.::
Delivery-date: Wed, 10 Oct 2007 15:05:50 +0200
Received: from inf182.kug.ac.at ([193.170.191.182] helo=puredata.info) by mail.iem.at with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.63) (envelope-from pd-list-bounces@iem.at) id 1IfbFx-0003kZ-IW; Wed, 10 Oct 2007 15:05:49 +0200
Received: from localhost ([127.0.0.1] helo=puredata.info) by puredata.info with esmtp (Exim 4.63) (envelope-from pd-list-bounces@iem.at) id 1Ifb1K-0006f9-6W; Wed, 10 Oct 2007 14:50:42 +0200
Received: from iem.kug.ac.at ([193.170.191.180] helo=mail.iem.at) by puredata.info with esmtp (Exim 4.63) (envelope-from pd@kristoflauwers.domainepublic.net) id 1Ifb10-0006f3-U0 for pd-list@puredata.info; Wed, 10 Oct 2007 14:50:23 +0200
Received: from dike.telenet-ops.be ([195.130.132.36]) by mail.iem.at with esmtp (Exim 4.63) (envelope-from pd@kristoflauwers.domainepublic.net) id 1Ifb5H-0003e3-69 for pd-list@iem.at; Wed, 10 Oct 2007 14:54:49 +0200
Received: from hoboe1bl1.telenet-ops.be (hoboe1bl1.telenet-ops.be [195.130.137.72]) by dike.telenet-ops.be (Postfix) with ESMTP id 8A084823C36 for pd-list@iem.at; Wed, 10 Oct 2007 11:34:07 +0200 (CEST)
Received: from localhost (localhost.localdomain [127.0.0.1]) by hoboe1bl1.telenet-ops.be (Postfix) with SMTP id 0426FD409C; Wed, 10 Oct 2007 11:34:07 +0200 (CEST)
Received: from Xi.kristoflauwers.domainepublic.net (d54C1E7D0.access.telenet.be [84.193.231.208]) by hoboe1bl1.telenet-ops.be (Postfix) with ESMTP id BC070D40AA; Wed, 10 Oct 2007 11:34:06 +0200 (CEST)
this tells us, that kristof sent his email at 11:34, that it was relayed within virtually zero time to hoboe1bl1.telenet-ops.be, where it waited for 3.5hours to be delivered to iem.kug.ac.at there are various reasons why this happens: e.g.
- server load: if the sending server has a huge queue of emails, your
email will be delivered after all these are delivered
- server load: if the receiving server is currently under heavy load, it
may not be able to immediately accept the email (it's the age of spam...)
- anti spam measurements: to drastically reduce the amount of spam,
greylisting is an established technique; this means that the receiver will not immediately accept an email; the sender will have to retry after a certain period (which spammers often don't!); this however means, that we are back to the start, the senders queue has to be worked through again,... the iem is happy to use greylisting
finally, the mailing list server took another 15minutes to send the email; after all pd-list has more than 1000 subscribers...
mfa.sdr IOhannes