title: Java Mail Sender in Spring Boot Scheduler
body: <p>i created a job that sending email automatic using java mail sender.</p>
  <p>i want to ask about java mail sender performance using SMTP GMAIL, is it normal sending email with attachment (1 MB size) it takes 1-2 minute to sending 1 mail only.</p>
  <p>is it possible to send mail in a second ? because i need to fast sending the mail to many customer email.</p>