Gmail has a security feature to identify a suspicious Gmail Login by an unauthorized person. In the internet world of hackers and identity thieves, your Gmail account is always under constant attacks and threats like any other email service. To alert of you of any actual and potential threats to your account, Gmail will give you a warning when an intruder has logged into your email account from an unfamiliar location. That means if somebody has logged into your account from an unfamiliar territory or IP Address e.g. in another country or state and you have not recently travelled outside the country and checked your mail in the process, then Gmail will send you a warning message [In Red] telling you that somebody has logged into your account.
If you receive a warning about unauthorized activity in your account, then you should check your “Last Account Activity”. This link is found at the bottom right of your Gmail dashboard .Click the [Details] link to see the login activity that has been taking place in the past minutes, hours or days.
When you have a red warning message [ for illegal Gmail Login ] at the top of your Gmail dashboard, it will tell you the country that the intruder has logged from, for example, if the intruder has logged in from Brazil, you will get a message that “…….your account was recently accessed from: Brazil”.You have two options – either to [ignore] the warning if you had recently accessed your mail in Brazil or to click [Show details and preferences] if you believe this is a suspicious login.
When you click [Details] at the bottom right of the page or [Show details…] on the warning message, you should see your recent activity including any activities by the intruder. The activity box will show you the country as well as the associated I.P. addresses that the intruder has logged from.
If you notice any suspicious I.P. addresses and locations, you should immediately change your Gmail password. The activity box will also show you multiple sessions of your browsers and computers where you are currently signed in. You might have forgotten to log out of your Gmail account from another computer or from multiple sessions on your browser. To sign out from multiple browser / computer sessions, you should click the [Sign out all other sessions] on the activity box. This will log you out from all your other currently open sessions in any location and leave you with your current session.
As you sign in and out of your Gmail account on a regular basis, Gmail will take note of these legitimate login sessions. Whenever there is a suspicious login, Gmail will not show the warning message to the suspicious IP address.Therefore, the intruder will not see this message and it will only appear to you the legitimate owner of the account.
This security feature has the ability to detect normal and abnormal activity, so it protects your account from being hijacked or stolen.
Google provides more information for users who believe their accounts have been compromised. Read the security tips here:
STEP 1: Log into your Gmail account.
STEP 2: Scroll down to the bottom of the page and to your right you should see “Last Account Activity”. Click the “Details” link to see the locations where logins have been made in the past hours or days.