Bouncing messages from documentation@global.libreoffice.org

Can someone please explain what this message means.

I am suspicious that it is SPAM

Peter Schofield
psauthor@gmail.com
Technical Writer, LO Documentation Team

mlmmj is a mailing list management program. The admin might have removed a recipient from the mailbox. But forgot/have not removed from the generic email-id (here doumentation@global.libreoffice.org). This mlmmj handles the bouncing messages and lets you know that it has handled them with care. 
It is not SPAM, AFAIK.
To know more about mlmmj, please refer to http://mlmmj.org/

I have been receiving such a message every time. I had to dig further to understand the scenario.
Thank you-Dev