[exim] Header from in maillog

Hi,

When ever mails are sent via script, the mail log will be something like:

-------------------
2013-09-10 07:46:56 1VJIf2-001qEs-6n <= user1@hostname U=user1 P=local
S=3773 T="Vakante Stellenangebote" for email@???
-------------------

As per my understanding user1@hostname is the envelop from. The header from
might be different.
Is there any way I can add header_from as well in exim maillogs?

Thanks in advance.

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Regards,
Soumya