How to find the status of FTP operation inside shell script

My Shell Script looks like this .

# Copying the dat file to Pool Talk server
     ftp -n $EPT_SERVER_NAME <<!
     quote user $EPT_USER
     quote pass $EPT_PASSWORD
     binary
     cd /ssss/ept$ENV/ddd/in/mbs
     lcd /ffff/l7$ENV/sss/out/2006
     put SchA.dat
     !
 # Copying the dat file to BloomBerg server
     ftp -n $BBERG_SERVER_NAME <<!
     quote user $BBERG_USER
     quote pass $BBERG_PASSWORD
     binary
     cd /export/xxxx/wyyyy/zzz/ftp/dddd/mfdisclose/input/
     lcd /appl/l7$ENV/data/out/2006
     put MF_SCHEDA_*.dat
     !

As it is obvious from the above code, that i am trying to ftp file to  two  different servers. Now i have a new requirement that says that if ftp to the first server succeeds, then i don't  have to ftp the file to the next server.  To achive that i need to know the status of the ftp operation. Please let me know how to find the status of the ftp operation inside shell script.

I tried $?, which i heard will give me the status of the last shell command. but in this case , i get 0 all the time even if the ftp fails to succeed. Please let me know the other solutions.

Thanks
Subha