Scam page hacking security

Today I found out that it is necessary for you guys to know that yahoo,gmail and every other mail agents will not ask you guys to re-login to your account when an upgrade or anything want's to be done to your account.
As for some of you that makes use of online account,you must take this very serious.
HOW POSSIBLE?
These days cracking is very common especially with teenagers.I know you must have heard of something called scam page one way or the other.
Scam page is a fake page configured by a cracker to steal information from you in other to get access to your privacy.This scam page is sent to the victim after configuration and in you by any means make use of it, your information will be sent to the sender of the scam page and he will have full access to your privacy and can do anything with it.
SOLUTION
Some people sends this scam page with their email account and with my post on how to trace the source of an email,you would be able to detect where it is from,if from a right source or a cracker.
Just trace the source of the message and you will verify if it's from the right source or not