Here i am using postfix on Centos 5.5. Squirrelmail is working fine except password is not changing from webmail "change password" plugins. Getting like error "--> 500 Old password is incorrect.” But password is ok. Please give some idea regarding above problem, it will be very helpful for me. Please if possible give me solution

hi here i am using postfix on Centos 5.5. Squirrelmail is working fine except password is not changing from webmail "change password" plugins. Getting like error "--> 500 Old password is incorrect.” But password is ok. Please give some idea regarding above problem, it will be very helpful for me. Please if possible give me solution