Google's Gmail SMTP server is a free SMTP service which anyone who has a Gmail account can use to send emails. You can use it with personal emails, or even with your website if you are sending emails for things such as contact forms, newsletter blasts, or notifications.
NOTE : Turn Allow less secure apps to ON. Be aware that this makes it easier for others to gain access to your account.
Simple code . Can send email to many people at a time with as many attachments .