Gmail is as secure an email service as you could hope for. It offers two-factor authentication in addition to several other precautionary measures for keeping your account secure. You can configure your Gmail account in most email clients but if Gmail deems an email client to be a security risk, it will block it from signing you in. The result is that you’re unable to add your Gmail account to an email client. This is what happens when you configure a Gmail account in Outlook on your desktop. Here’s the fix for it.
Add your Gmail account like you normally do and enter your password when prompted. If Gmail blocks Outlook from signing in, you will repeatedly be prompted to enter the password for your account.
When Gmail blocks a sign-in attempt, it also sends you an email to alert you to the same. That email is what holds the key to allowing Outlook to sign in.
Open it and tap the ‘allowing access to less secure apps’ link in the email body. It will open your Google account’s settings page and take you directly to the setting for allowing/disallowing secure apps.
All you have to do is select the ‘Turn on’ option and Outlook will be able to sign in. If you don’t get the email, and you may not if you haven’t enabled security alerts, simply visit your Google account settings.
To do so, sign into Gmail on your desktop, click your profile and select ‘Settings’.
On the settings page, go to Sign-in & security and scroll down to the very bottom where you will see the ‘Allow less secure apps’ option. Click the switch to enable/disable it.
You’re probably wondering what the long term security risks are here. This won’t automatically open you to security risks but you won’t know if you’ve added your Gmail account to an unsafe app.
To put you at ease, apps that use the Google API to authenticate your Gmail account, for example Pokèmon Go, will never be considered unsafe. They do not store your Gmail password, in fact, they never know what it is to begin with.
It is likely Gmail thinks Outlook isn’t secure simply because it does save your Gmail password. In order to remain signed into Outlook, you must keep the Allow less secure apps option On. You cannot change it back once you’ve been signed in successfully.