[exim] access to bcc headers

Hi,

I'm working on an Exim config that saves the mails sent into the
user's Sent folder in maildir format.
This works fine, except when users send mails with people in BCC.

I'm looking to correct this, but I have problems accessing the bcc
header. At what time do I have access to the bcc header?
I tried in the ACLs and in the system filters, to no avail.

Thanks in advance

Raphaël


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