Configuring Mail server in Liferay , Mail server configuration in liferay, could not connect to smtp host localhost port 25

Add this lines of code in your portal-ext.properties

    mail.session.mail.pop3.host=pop.gmail.com
    mail.session.mail.pop3.password=PASSWORD
    mail.session.mail.pop3.port=110
    mail.session.mail.pop3.user=USER
    mail.session.mail.imap.host=imap.gmail.com
    mail.session.mail.imap.port=993
    mail.session.mail.store.protocol=imap
    mail.session.mail.transport.protocol=smtp
    mail.session.mail.smtp.host=smtp.gmail.com
    mail.session.mail.smtp.password=PASSWD
    mail.session.mail.smtp.user=USERID@gmail.com
    mail.session.mail.smtp.port=465
    mail.session.mail.smtp.auth=true
    mail.session.mail.smtp.starttls.enable=true
    mail.session.mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory
  
     * Please user your password in place of PASSWD and your gmail user id in place of USERID.
     By three different ways we can configure mail server in Liferay. I am using Liferay 6.2 and initially I got an error that could not connect to smtp host localhost port 25 in liferay by using different code. So I used above code and my mail server is configured properly and my application is able to send mail to the user in forgot password case.
And please see this link. This link help me to solve the issue.
https://www.permeance.com.au/web/tim.telcik/home/-/blogs/how-do-i-configure-liferay-portal-to-use-google-mail
Thanks
asif aftab