mailq command question (in 5.0.x)

[tiger2000]

just curious about the relationship between postfix mailq and sendmail commands.

the mailq command in /opt/zimbra/postfix/sbin/ directory, actually is the soft link to 'sendmail'

lrwxrwxrwx  1 zimbra zimbra 53 Apr 21 14:26 mailq -> ../../../../opt/zimbra/postfix-2.4.7.5z/sbin/sendmail

when i execute :

cd /opt/zimbra/postfix/sbin
./mailq

it will return the queued email information. But it's not same as when running './sendmail' in same directory??

if using 'sendmail', then it should be ./sendmail -bp

anyone knows why?