how manipulate header

[gmo]

Hello,

i've the follows configuration:
[POP-Client] <-> [qmail-intern] <-> [qmail-extern] <-> [Internet]

when the POP-Client send an email, this goes to qmail-intern, then
qmail-extern (I'd like here manipulate the qmail header, put out the header
lines from POP-Client and qmail-intern! Only the eMail header lines from
qmail-extern should be exist!) --> Internet

Have any body any idee?

Thank for the help

Gustav

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