gmail smtp 메일 보내기 - 오류해결

https://stackoverflow.com/questions/3949824/smtp-error-could-not-authenticate-in-phpmailer?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa

read this Google Help (https://support.google.com/mail/answer/14257?p=client_login&rd=1)

1. Open your web browser and sign in to Gmail at http://mail.google.com/mail. If you see a word verification request, type the letters in the distorted picture and finish signing in.
2. Close your browser and try accessing your messages in your email client again.
3. If you're still having problems, visit http://www.google.com/accounts/DisplayUnlockCaptcha and sign in with your Gmail username and password. If necessary, enter the letters in the distorted picture.
4. Click Continue.
5. Restart your mail client and try accessing messages in your email client again.