I am looking for a way to use sendmail to modify an outbound email; I
want to trim the "From:" header so that certain trailing characters
are stripped off.  Email destined for the Internet is generated from
within the company (using Exchange) with a "From:" line that looks
like this:

Firstname Lastname (Company Name)

Outbound email is relayed through a machine running the most recent
version of sendmail. I would like sendmail to strip off the " (Company
Name)" so that the resulting "From:" line appears to external
recipients as simply:

Firstname Lastname

Due to factors beyond my control, I cannot take the straightforward
approach and simply modify Exchange so that the From: starts out
correctly.

I have searched comp.mail.sendmail, and have scanned the 1200+ page
Sendmail O'Reilly book.  I expect sendmail can do this, but how?  If
it can be done, I expect that this would be via one or more rulesets
placed strategically within sendmail.cf.

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Clarification of Question by ujang-ga on 25 Dec 2003 21:43 PST

Editing the source code for sendmail is not option available to me.
I can only edit the sendmail.cf, or any of the other config files.

rpm -e sendmail
download the source file of sendmail
edit the headers.c
edit the chompheader function:(when come to From:.... line, change it
and save it with new value)
make
make install

You can also edit other parts of the source.
(When sending out etc.)