Please close this issue: This is a memory issue.. solutiion is simple icrease ram usage by courier.. there's no more solution
Also it has combined exim4 shit i already make some test with debian 6 and debian 9 (courier 0.6X and courier 1.0.6 respectivelly backported) and for huge amounts of mails (around of thousands of in courier-mlm) the solution was increase ram usage and daemons (config files pointing that) -- Lenz McKAY Gerardo (PICCORO) http://qgqlochekone.blogspot.com
