[Mailman-Users] How to know if all messages were distributed

[Carl Zwanzig]

On 5/25/2015 9:54 AM, Mark Sapiro wrote:

> I overlooked this in my earlier reply. If you mean that in your post you
> have requested to be notified when the recipient reads the message,
> Mailman makes some effort to remove all such requests from message
> headers before sending the message, so any DSN you received is more
> likely a bounce, but you shouldn't be seeing those either as they should
> be delivered to the Mailman's bounce processing.

And some people will routinely discard or dismiss those requests, too. 
Return receipt is not a reliable way to tell if someone has read the message 
unless all of the recipients are willing and they actually get the request.

z!