Gmail smtp not working

Can I Use the Gmail SMTP Server fot Sending Email
If you are using other email clients, such as Thunderbird or Outlook, you can use Gmail's SMTP server details to keep sending emails through your Gmail smtp not working.

However, remember that SMTP only sends by email. If you receive emails in your Gmail account in another email client to use POP3 or IMAP. You can find these settings by opening your Gmail settings and going to the Forwarding and POP / IMAP tab.

Gmail SMTP Troubleshooting
If you use Gmail as an outgoing email server and cannot send the correct email, Google may block login attempts from your applications or devices. Depending on whether you use Google Apps or not, the steps to fix it will be different.

For Google app users
If you are a Google Apps user, you will need your administrator to allow users to change the policies of less secure applications. If you are a Google Apps administrator, follow these steps:

Navigate the Google Apps Control Panel.
Click on "Security" and then on "Basic Settings".
Look for "Less secure applications", then click "Go to Settings for less secure applications".
Select "Allow users to manage their access to less secure applications."