Password leaked

[LordSquirt]

I saw this thread was already made, however, it was closed by Sam for unknown reasons. I checked my e-mail and I received a similar e-mail which said,

GraalOnline Password Problem

Hello Squirt,

Due to a problem with our support center some email addresses and passwords have been leaked. If the password you have used on support.graalonline.com is also used for other services such as gmail or facebook then we recommend to change those passwords as soon as possible. Sorry for the problems this has caused.

Best Regards,
GraalOnline Management

Some of you may have gotten the same e-mail. Make sure you check and change your passwords if you need to.

The problem is how am I supposed to change my passwords if I don't know which password I used to register with. I registered for the Support Center a LONG time ago and when I went on it my password was auto saved, so i'm not familiar with which password I used to sign up. Therefore, is there some way to find out which password I used? If they were compromised they are obviously stored somewhere so is it possible to check then give it to me, so I can change my other passwords?