Brad Knowles wrote:

...

When I send a message to a Mailman list with 100 members, does Mailman inject one message with 100 addresses BCC'd, or 100 messages with one address BCC'd?

Proper mailing list management systems don't use blind-carbon-copies. The equivalent that they do use is to list multiple envelope recipients, whose addresses are not necessarily referred to on the "To:" or "Cc:" headers.

I didn't realize Mailman integrated with the MTA enough to do it that way. Thanks.

However, it depends on how the mailing list software is configured. If personalization is enabled, then it will send out individual messages to each and every subscriber. If personalization is not enabled, it will send the messages out in small batches, as controlled by your site-wide configuration.

Does this mean that I configure how many recipients in each injection? For example, I could set it to a high enough number that only a single message was injected, or break up a distribution list into 10ish emails, or whatever?

Thanks for your response,

--joshua.