Not able to send email using Javamailserver, Connection refused - spring-boot

Question

I'm trying to send an email from my Spring boot application. Here are my configuration properties.
spring:
application:
name: spring-base-template
profiles:
active: ${env:local}
mail:
default-encoding: UTF-8
host: company.host.name
username: myusername#domain.com
password: mypassword
port: 587
properties:
mail:
smtp:
auth: true
starttls:
enable: true
socketFactory:
port: 465
class: javax.net.ssl.SSLSocketFactory
fallback: false
protocol: smtp
test-connection: false
My sample code look like this
try {
SimpleMailMessage mail = new SimpleMailMessage();
mail.setTo("myusername#domain.com");
mail.setFrom("myusername#domain.com");
mail.setSubject("Registration Confirmation");
mail.setText("You are registered Successfully! Thank you for being with us!");
javaMailSender.send(mail);
} catch(Exception e) {
e.printStackTrace();
}
When I try to send the email, following is the exception
org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Could not connect to SMTP host: company.host.name, port: 587;
nested exception is:
java.net.SocketException: Connection reset. Failed messages: javax.mail.MessagingException: Could not connect to SMTP host: company.host.name, port: 587;
nested exception is:
java.net.SocketException: Connection reset; message exception details (1)
are:
Failed message 1:
javax.mail.MessagingException: Could not connect to SMTP host:
company.host.name, port: 587;
Any ideas would be greatly appreciated.