Java Mail Sender Android with Kotlin & Java

• API JavaMail (Gmail Sender Message)
  
  

• Make sure not to use private email
• Go To Google Account
  
• Go To Security
• Turn off 2-Step Verification
• Turn off Less secure app access

In the file Credentials.kt change the following line with the email that will be used as Sender

object Credentials {
    const val EMAIL_SENDER = "your_email"
    const val PASSWORD_SENDER = "your_password"
}