On Jan 05, 2012, at 05:03 PM, Murray S. Kucherawy wrote:

...

Actually, I was asking about the default for personalized vs. non- personalized delivery. Right now, the default is to send all users the same copy of the message (with some configurable batching sizes) in order to reduce network bandwidth, i.e. non-personalized. By switching to personalization by default, we can enable VERP by default, personalized footers, etc. Personalization would allow for giving users more choices about subject munging, footer adding, etc. but of course it would consume more network bandwidth and server resources to stitch together individualized messages.

A little optimization is possible in that scenario, namely the cross product of all the possible munging options that the current subscriber list has enabled. I don't know how easy or hard that might be to code in mailman, but I imagine it's possible.

Possibly, but it depends on the level of individualization. If you're doing VERP or personalized footers you pretty much have to send one message per user.

-Barry