SMTP Config
So if you want to enable mail sending then you must configure this mail/smtp configuration in admin panel.
You can find this settings in SMTP Settings Tab.
Enter all SMTP Details as shown in screen shot below

Hosting Server:
If you have problem with mailing with this setup than please contact your provider with those variables and ask correct info
Gmail:
NOTE: You have to set less secure apps access your account enable and 2 factor authentication off Less secure apps - Google Account please go through this Link
Default config details for Gmail SMTP
Gmail SMTP Host: smtp.gmail.com
Gmail Email: [email protected]
Gmail Password: ******
SMTPSecure(TLS) - Port No.: 587
SMTPSecure(SSL) - Port No.: 465

