JavaMail API : Username and Password not accepted (Gmail)

Question

I want to send email from my java application to gmail account I used the following code and javaMail API ,But Gmail not accepted username and password and exception thrown

Answer 1

You can try to allow unsecure applications, it worked for me.

Steps for Gmail account :

1. Sign in to Gmail
2. Click here to access Less Secure App Access in My Account.
3. Next to “Allow less secure apps: OFF,” select the toggle switch to turn ON.

See this link for Gmail and G-Suite.

Answer 2

To be able send mail messages via your gmail account, you should allow unsecure applications (which your application is by gmail's point of view) in google account security settings.

UPD: Also, if you want to see debug messages, use next java mail property:

props.put("mail.debug", "true");

It can help you to find out what happening behind the scenes.