mail receipt

how can I control a mail receipt sent from unix using sendmail

What do you mean ? Can you please give more details ?

When i send a mail with sendmail in unix , how can i know that the mail was delivery.
How can i receive a delivery receipt for the message that i send.

See this.

1) I tried this in the normal_delivery file
-------------------------------------------------------
From: edinfor.joao.meireles@oni.pt
To: edinfor.joao.meireles@oni.pt
Cc: edinfor.nuno.pires@oni.pt
Subject: Teste de envio de e-mail c/ delivery
Return-Receipt-To: edinfor.nuno.pires@oni.pt
RrtImpliesDsn=True
Mensagem enviada dia 2002-10-09, �s 1500h
Primeira linha do e-mail: Repbildev01

Test
----------------------------

2) And used the unix command :
/usr/lib/sendmail -t -v -r edinfor.nuno.pires@oni.pt < normal_delivery

3) The message got to the user but there was no return receipt delivered to edinfor.nuno.pires@oni.pt

4) What am I doing wrong ?