On 11/30/2011 13:32, Georgi Meyer wrote:
> Hi,
> 
> I have a question concerning two lists that I have and I have about 20 people 
> subscribed to both lists. When a mail is sent to one list at a time the 
> subscribers get the mail as expected. When a mail is sent to both lists the 20 
> subscribers only receive one list. Now to my understanding Listserv doesn’t 
> filter out addresses unless it is setup in the tree structure that allows 
> filtering. We currently don’t have a tree structure setup in our listserv. How 
> would the listserv filter the addresses from the two lists? In the log file I 
> see that the mail was sent to the 20 people from both lists but they did not 
> receive the mail twice.
> 
> Is my assumption correct?
>

The most likely explanation is that the second copy of the single message is being 
filtered as a duplicate, based on the message-id, by the recipients' email service 
provider(s) and/or email clients. Gmail does this. There may be other providers who do 
this, as well.

-- 
Paul Russell, Senior Systems Administrator
OIT Messaging Services Team
University of Notre Dame

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