[ale] sendmail question

[cforsell at roman.net (Carl Forsell)]

I have a customer who has has a Linux e-mail server (sendmail) inside their
firewall and  connects through ISDN to us for internet access.  They have a
concern about confidential documents that they e-mail within the office.

In the system described above, I can't see how the e-mail could loop through
us during it's travel - or be intercepted by "outsiders".  Am I wrong?  Is
there any way of documenting that a piece of internal e-mail has never
passed out side of their firewall?

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