plz help me its urgent

hi

On windows plat form i can send mail but while using linux i cant
there is a mail server in our lab having address 172.20.4.4
and my user name on that server is bcs_f99_008@comsats.edu.pk
now i have to configure my linux system such that i could send mail by my php interface and recive that as well in mysql database on my linux computer first of all plz tell me how to configure that to send mail

and if u could tell me the function to recive mail
thanks

on windows my php.ini configurations are below


[mail function]
; For Win32 only.
SMTP = 172.20.4.4
; for Win32 only

; For Win32 only.
sendmail_from = me@localhost.com ; for Win32 only

; For Unix only. You may supply arguments as well (default: "sendmail -t -i").
;sendmail_path =



and plz reply soon coz my project due date is tooo near

i will be greatful to u.
thanks
Ali safwan.

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