On 08/14/2012 06:49 PM, Fabian Wenk wrote:
Hello Stefan
On 14.08.2012 16:11, Stefan Rothenbuehler wrote:
On 08/14/2012 03:42 PM, Tobias Oetiker wrote:
occasionally we get mail bounces from bluewin that look like this:
Jul 6 13:17:31 xxxx postfix/smtp[30166]: xxxx: to=<[email protected]>,
relay=mxbw.bluewin.ch[195.186.99.50]:25, delay=2,
delays=0.02/0/0.05/2, dsn=5.0.0, status=bounced (host
mxbw.bluewin.ch[195.186.99.50] said: 551 551<[email protected]> Account
administratively disabled. Please try later (in reply to RCPT TO
command))
Those mails are rejected as the recipients account has been
administratively blocked. This can have various reasons which I'm not
gonna list here.
I do see a discrepancy here. The mail account is temporary "closed",
as you say and also the text "Please try later" does indicate. But the
error 551 is a permanent error and the sending server will purge this
e-mail from the queue and notify the original sender of the non-delivery.
It would probably be a good idea to respond only with a 4xx error,
which is temporary. So the sending server could queue the e-mail and
try again later, without any interaction from the end user. Usually
the sending mail server does notify the original sender, after
delivery of the e-mail has failed for several hours. It then will try
up to 5 days to deliver this e-mail, before the e-mail will be purged
from the queue and the original sender being notified.
But sure, this depends on how long such accounts are administratively
blocked. If it is only for a few days, then a 4xx error would be much
friendlier, also to the affected Bluewin customer. If one of this
customer is also subscribed to several mailing lists, then there is a
very high chance, that he will be automatically unsubscribed from them
as well.
Just my 2 cents.
bye
Fabian
Hi Fabian
We send a 551 on purpose. This is mainly to protect our customers (let
the sender know that some action has been taken). I'm not gonna explain
the details here on the list but if you're interested to know the
reasons of this behavior you can contact me off list.
Regards, Rothi
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