XF 2.0 email not working

[Spartan]

Email are not being sent for the contact form, password reset, etc. I've disable all addons, and it still doesn't work.

Where should I look first to begin troubleshooting this issue?

 

[Ozzy47]

The troubleshooting guide here will identify the cause of most common errors:
https://xenforo.com/community/resources/email-troubleshooting-guide.5086/