Earlier i was using the mailx command on Sun Solaris server and corresponding option was -r using which i gave the sender's address.
mailx -s "subject" -r firstname.lastname@example.org email@example.com
I am unable to find a corresponding option for the mail command on linux.
mail -s "subject" ?? firstname.lastname@example.org email@example.com
PS : to add to the above, i am invoking the mail command from a script