how do I change the email sender if I donot have the -r option?

Hey,

after I check the man page for mail and mailx, I did not find the -r option. But, I have to change the email sender, how can I do it?

   Send Mode
              mailx [-s subject] address...

   Receive Mode
              mailx -e

              mailx [-HiNn][-F][-u user]

              mailx -f[-HiNn][-F][file]
     mail [-iInv] [-s subject] [-c cc-addr] [-b bcc-addr] to-addr...
     mail [-iInNv] -f [name]
     mail [-iInNv] [-u user]

---------- Post updated at 11:30 AM ---------- Previous update was at 10:24 AM ----------

anyone can help? thanks, dudes

---------- Post updated at 11:55 AM ---------- Previous update was at 11:30 AM ----------

Oh My God, I found it.

mail -s "subject" mail1@server.com -- -r "from@fromserver.com" 

Working amazingly!!!