thread marked Dave Null

[Amedee Van Gasse (Ubuntu)]

Tommy Trussell schreef:
> On Sat, Mar 28, 2009 at 8:59 AM, Amedee Van Gasse (Ubuntu) 
> <amedee-ubuntu at amedee.be> wrote:
>> My only question is, how will the mailing list software react if it
>>  occasionally gets rejects on the mail it sends to me? If my
>> solution has a negative side effect, then I will accept the emails
>> and then silently discard them with procmail.
>> 
>> Is there a mailing list expert who can answer this? To resume: I am
>> telling my Postfix to reject certain mails from this mailing list,
>> based on the subject.
> 
> I don't consider myself an "expert" but I do manage several Mailman 
> mailing lists. The software has a setting where it will drop a person
>  after a certain number of failed delivery attempts. Here is the 
> algorithm it uses:
> 
>> Bounce processing
>> 
>> These policies control the automatic bounce processing system in
>> Mailman. Here's an overview of how it works.
>> 
>> When a bounce is received, Mailman tries to extract two pieces of
>> information from the message: the address of the member the message
>> was intended for, and the severity of the problem causing the
>> bounce. The severity can be either hard or soft meaning either a
>> fatal error occurred, or a transient error occurred. When in doubt,
>> a hard severity is used.
>> 
>> If no member address can be extracted from the bounce, then the
>> bounce is usually discarded. Otherwise, each member is assigned a
>> bounce score and every time we encounter a bounce from this member
>> we increment the score. Hard bounces increment by 1 while soft
>> bounces increment by 0.5. We only increment the bounce score once
>> per day, so even if we receive ten hard bounces from a member per
>> day, their score will increase by only 1 for that day.
>> 
>> When a member's bounce score is greater than the bounce score
>> threshold, the subscription is disabled. Once disabled, the member
>> will not receive any postings from the list until their membership
>> is explicitly re-enabled (either by the list administrator or the
>> user). However, they will receive occasional reminders that their
>> membership has been disabled, and these reminders will include
>> information about how to re-enable their membership.
>> 
>> You can control both the number of reminders the member will
>> receive and the frequency with which these reminders are sent.
>> 
>> There is one other important configuration variable; after a
>> certain period of time -- during which no bounces from the member
>> are received -- the bounce information is considered stale and
>> discarded. Thus by adjusting this value, and the score threshold,
>> you can control how quickly bouncing members are disabled. You
>> should tune both of these to the frequency and traffic volume of
>> your list.
> 
Hmmm ok so I might get unsubscribed if I bounce too much. Denial of
Service :-/
Ok then I'll consider delivering to Dave Null, but only for mail coming
from this list.
Thank you for explaing, Tommy.