On Fri, 3 Apr 2009, Brad Knowles wrote:
Yahoo expects me to respond promptly to 5xx bounces, disabling any
subscriptions, otherwise it starts generating 'greylist' 4xx bounces for
my mail. Unfortunately, if I try to lower the bounce threshold, the
now-daily occurence of 4xx bounces guarantees that all yahoo addresses
will end up disabled. Is there any way, short of fiddling with and
recompiling from source, to separate 'hard' bounce handling from 'soft'
bounce handling, or to change the 'scores' that each accumulates?
Thing is, Mailman doesn't see the 5xx or 4xx codes directly. It hands
the messages off to your MTA, and your MTA sees those codes.
Good point. Even though I'm seeing 'deferals' in the MTA logs, they
don't go long enough to generate '4 hour warnings' that mailman
would have to handle as a 'soft bounce'. Just verified this in the logs
(where I should have looked first! LOL). Excellent! Thanks!
Since we do not, and we cannot, have direct access to the 5xx versus 4xx
response codes from Yahoo!, I don't think it makes a lot of sense to try
to modify the code to treat a bounce resulting from a permanent 5xx
response code any different from a "delayed message" notice resulting
from a temporary 4xx response code.
(nod) No, all I need to do now is lower the threshold so Yahoo won't see
so many attempts to send mail to 5xx addresses.... Then maybe they'll stop
doing so many 4xx delays of my mail (not just a mailman problem,
incidentally).
Set up your MTA to handle Yahoo! separately from other sites, so that
any slow downs there don't slow you down in getting to other domains,
and vice-versa.
I use postfix, so the performance of yahoo delivery doesn't really impact
other mail, other than the impact of the extra load of retries...
Though I find it ironic that Yahoo sends lots of mail to me for unknown
users.... :)
Thanks again!
- Charles
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