"Scot L. Harris" <webid@xxxxxxxxxx> writes: >> I don't want to rely on the client, because I could change it sometime >> (and I actually did it many times). I rather prefer a "system" solution. >> Clearly, a per-user solution would be better in order to prevent users >> to look at each other's mail, just like it happens with >> /var/spool/mail/<user>. >> >> Many thanks in advance. > > I had to implement something similar recently. In my case I am using > sendmail. The solution I used was milter-bcc. > > http://www.milter.info/milter-bcc/index.shtml Another milter that will copy all outgoing and incoming is Synonym. http://www.modulo.ro/synonym/