[MVMA] Recently, there have been 2 accounts automagically unsubscribed due to excessive 'bouncing'.

[Chuck Gelm]

    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 
<http://mailman.qth.net/mailman/admin/mvma/bounce?VARHELP=bounce/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 
<http://mailman.qth.net/mailman/admin/mvma/bounce?VARHELP=bounce/bounce_you_are_disabled_warnings> 
the member will receive and the frequency 
<http://mailman.qth.net/mailman/admin/mvma/bounce?VARHELP=bounce/bounce_you_are_disabled_warnings_interval> 
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 
<http://mailman.qth.net/mailman/admin/mvma/bounce?VARHELP=bounce/bounce_info_stale_after> 
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.

*Description*

	
*Value*

/Bounce detection sensitivity/

Should Mailman perform automatic bounce processing?
(Details for *bounce_processing*) 
<http://mailman.qth.net/mailman/admin/mvma/?VARHELP=bounce/bounce_processing>
	
No 	Yes

The maximum member bounce score before the member's subscription is 
disabled. This value can be a floating point number.
(Details for *bounce_score_threshold*) 
<http://mailman.qth.net/mailman/admin/mvma/?VARHELP=bounce/bounce_score_threshold>
	
The number of days after which a member's bounce information is 
discarded, if no new bounces have been received in the interim. This 
value must be an integer.
(Edit *bounce_info_stale_after*) 
<http://mailman.qth.net/mailman/admin/mvma/?VARHELP=bounce/bounce_info_stale_after>
	
How many /Your Membership Is Disabled/ warnings a disabled member should 
get before their address is removed from the mailing list. Set to 0 to 
immediately remove an address from the list once their bounce score 
exceeds the threshold. This value must be an integer.
(Edit *bounce_you_are_disabled_warnings*) 
<http://mailman.qth.net/mailman/admin/mvma/?VARHELP=bounce/bounce_you_are_disabled_warnings>
	
The number of days between sending the /Your Membership Is Disabled/ 
warnings. This value must be an integer.
(Edit *bounce_you_are_disabled_warnings_interval*) 
<http://mailman.qth.net/mailman/admin/mvma/?VARHELP=bounce/bounce_you_are_disabled_warnings_interval>
	
/Notifications/

Should Mailman send you, the list owner, any bounce messages that failed 
to be detected by the bounce processor? /Yes/ is recommended.
(Details for *bounce_unrecognized_goes_to_list_owner*) 
<http://mailman.qth.net/mailman/admin/mvma/?VARHELP=bounce/bounce_unrecognized_goes_to_list_owner>
	
No 	Yes

Should Mailman notify you, the list owner, when bounces cause a member's 
subscription to be disabled?
(Details for *bounce_notify_owner_on_disable*) 
<http://mailman.qth.net/mailman/admin/mvma/?VARHELP=bounce/bounce_notify_owner_on_disable>
	
No 	Yes

Should Mailman notify you, the list owner, when bounces cause a member 
to be unsubscribed?
(Details for *bounce_notify_owner_on_removal*) 
<http://mailman.qth.net/mailman/admin/mvma/?VARHELP=bounce/bounce_notify_owner_on_removal>
	
No 	Yes

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