I am new to wordpress. I searched on internet about how to send mail from localhost in wordpress on ubentu system. I tried to set up using sudo commands but not getting result again error comes
SMTP ERROR: Failed to connect to server: Connection refused (111)SMTP connect() failed.
I tried with this link
First you need to have a SMTP server configured in your system or have your WP pointing towards a third party SMTP not sure if you have this already.
Just install mail SMTP plugin https://wordpress.org/plugins/wp-mail-smtp/#installation and set your SMTP credentials.
After that mail will start going from your localhost.