[Exim] differentiate between local and outside users

hello all

i am new to linux and exim. so, my questions may appear to be basic.

i have gone thru the docs and could not find answer to this.

at home, i have one pc on which all my family members are users. but we all
have only one isp account. so we all use it for outgoing mails. for incoming
mails, we have separate accounts.

my exim set-up was done using exim-config smarthost option. i have only
changed the smtp auth required by my isp in /etc/exim/exim.conf.

i also added these entries

sandip: sandip@???
father: sandip@???
daughter: sandip@???

in /etc/email-addresses.

without this, we are not able to send messages to outside world.

with this setup we can send messages to outside world without any problem.
we can send messages to eachother also.

however, when i get a message from my daughter, it seems to be coming from
sandip@???. i think it is the entry in /etc/email-addresses thats
doing this.

how do i prevent it from happening?

--
regards,
sandip p deshmukh
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