[pydotorg-www] Fwd: Delivery Status Notification (Failure)

Ralf Hildebrandt Ralf.Hildebrandt at charite.de
Sun Dec 4 10:57:40 CET 2011

* Steve Holden <steve at holdenweb.com>:
> [definitely not urgent]
> OK, how does this look? And if it looks OK, how come I'm still getting bounced at pythoncraft.com?
> """ Technical details of permanent failure: Google tried to deliver
> your message, but it was rejected by the recipient domain. We recommend
> contacting the other email provider for further information about the
> cause of this error. The error that the other server returned was: 550
> 550 5.1.0 <steve at holdenweb.com>: Sender address rejected: User unknown
> in virtual alias table (state 14). """

This looks like the recipient domain does sender address verification
and the mailserver for the sender reported "User unknown in virtual
alias table" (and maybe that data is old, but cached)

steve at holdenweb.com is definitely  being valid ( :) ) and (I just
tested this) being accepted by every MX host. 

Thus I'm assuming that the MXes for pythoncraft.com (which are using
postfix) cached the negative  verification result. The default
settings are:

address_verify_negative_cache = yes
address_verify_negative_expire_time = 3d
address_verify_negative_refresh_time = 3h

Meaning that it may take up to 3 days for the wrong data to expire.
How old is that report (I took the weekend off :) )

Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebrandt at charite.de | http://www.charite.de

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