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Well, there you go , you're actually using 2 different 'mail' programs.
In fact, in mailx, the -f switch says
Read in the contents of the user's mbox (or the specified file) for processing; when mailx is quit, it writes undeleted messages back to this file. The string file is handled as described for the folder command below.
which is not what you want.
Either use the same prog on both systems OR use the correct flags in each case.
When I remove mailx on the second server, there is no mail-command also.
That's because mail, is just a symlink on that system to mailx. If you remove mailx, obviously there's no mail(x) program to use.
Just install mailx on both and check you've actually got mailx as a program, not a symlink.
Maybe its a version issue; can you tell us what versions of Centos you have.
On my Centos 6.3, the default install is mailx as the real program and mail as a symlink thereto.
Last edited by chrism01; 11-26-2012 at 08:24 PM.