On Mon, Jan 06, 2014 at 03:04:20AM -0000, John Levine wrote:
> Looking at the logs, I'm seeing a lot of "550 Action not taken" at end
> of data from recipient systems which I believe are running Postfix.
> Can someone tell me what that means, so I can tell the recipients to
> undo whatever they did to cause it?
This is not a Postfix response. Postfix >= 2.3 advertises:
250-ENHANCEDSTATUSCODES
and would generally respond with "550 5.X.Y ...". Not surprisingly,
a search of the Postfix source code finds no such response:
$ git grep "Action not taken"
$
However, this could be the response from a pre-queue virus scanner
(milter or pre-queue filter proxy) or a remote response to a
recipient verification probe. Similar thread:
http://postfix.1071664.n5.nabble.com/550-Action-not-taken-td58892.html
--
Viktor.
