I tried to find an answer on the forums but got lost, so I had to open a topic.

I did forget my passwords and when I wanted to recover my account, I figured out I changed my mail long ago.

Luckily I recalled my old password, but I like to update my mail, problem is I can't without remembering my old mail, which proves to be a tough cookie.

Choose the first option
https://forums.d2jsp.org/recovery.php

Got the replay: The account appears to already have been recovered. Please use the Settings page to change your Password, Gold Password, or Email Address.

... and now i'm at start again, I can't change my email, cause I don't know my old email >.>

Bump. 2nd try got: The information you provided was not able to be confirmed or validated.

....

Had an issue recovering my account once. Kept being denied. When i finally did manage to login months later..

First thing i did was buy 10$ worth of fg..

Then used that transaction id in providing more info for recovery.

Hum, is it allowed to just make a new account and transfer all your gold to it?

No, its not allowed


Taken from here:
http://forums.d2jsp.org/info.php?p=9

I mean one would abandon its old account and so own only one.

The only one who can answer that is Kevin
https://forums.d2jsp.org/staff.php?g=4