Why do emails sometimes have a sender similar to “list-manager@simplelists.com on behalf of sender@email.com?”
This is how some email clients choose to display the messages. We distribute messages with the same From address that they are received with, but we have to add sender information to sign the messages with our DKIM signature (this proves they came from us and improves deliverability) and we also have to add a return address so that bounces are handled automatically. It is these addresses that some email clients display. The only way to stop the above being displayed would be to remove the extra sender information, which would break our automatic bounce handling and also reduce the chance of your message getting delivered.
