[Mailman-Users] Injecting Single Messages

[Larry Hansford]

There seems to be a problem with the Mailman method of delivering 
messages.  I'm running Mailman 2.1.1 with Postfix 2.0.7.

Mailman messages are being sent as individual messages, rather than a 
message with multiple addresses.  For example, if there are 10 list members 
on the same ISP, Mailman delivers 10 different messages to that ISP rather 
than sending 1 message with 10 delivery addresses.

Is there a configuration setting in Mailman that will change this 
behavior?  It seems that the older versions of Mailman did deliver single 
messages with multiple addresses, but I don't have any servers left running 
older versions.

Thanks!

Larry