Gmail Attacked: We believe your account was recently accessed

One day when we login our Gmail, I found there was an Alarm in red color on the top:

Warning: We believe your account was recently accessed from: xxxx (inetia.pl: xx.xxx.xxx.xxx).

We knew our Gmail password might be stolen, or there was hacker from some where accessed our Gmail account.

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When we click the detail link, we found there were not only one time the other people accessed our Gmail:

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The first step we should do is change password immediately.

And then, check is there other place your Gmail is using: Scroll down your Gmail to the bottom, you can see there is information on the top bottom corner indicates how many place current Gmail is using and the login time.

 

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If you found the Gmail is open in other places, please click the Details link and Sign out all other sessions:

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Change all other settings about security, see as following:

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Change Recovery settings, the security question you set for your account:

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Also, you have to double check whether your Gmail was set other stuff such as forward automatically, multiple log in etc. So go to Gmail settings to check:

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Check each setting item carefully, for example: whether your signature was input some robot script, remove the signature content then; and Forwarding, POP and IMAP, you’d better disable all of them if you can not make sure you have set something by yourself.

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