It has come to my attention that the BuildCraft forum database has been compromised and dumped.
Usernames, email addresses and private messages were all compromised. If you changed your password on or after the 17th of March, 2015 (when we changed our forum engine), it is still secure, as these were hashed and salted. Passwords configured before that date use an old hashing algorithm which is less secure - these may have been compromised. Either way, I urge you to change your password as soon as possible on all websites on which you used the same password.
I do not have sufficient information to pinpoint what the vector of the attack was, and for that reason I'm forced to take down the forums until further notice. If you're looking for AlexIIL's BuildCraft 7.2.0 beta, use this URL.