Click on "forgot password" link from Forum page. Then fill in valid email address. Click on "Send me the password reset link". Got "Thank you! The password reset link has been sent to email@example.com". However, the email is not received by firstname.lastname@example.org.
I tried to create a test php page on the same web site. PHP mail() function is called from the php page. The email is received. That means the web server and PHP setup are OK.
SilverStripe version: 2.2.3
Forum Module version: 0.1.2
For us, the problem turned out to be the DNS setup that we had done with our hosting provider. For example, if your website is www.xyz.com, and you have an outside provider to host the website, but handle email (@xyz.com) in-house or with a different provider, then you have to be careful how you set up subdomains or parked domains. In our case, the email function was actually working, but the web host's system was trying to take a shortcut with the delivery, saying "this email is addressed to someone at @xyz.com, and *I* am @xyz.com, so I won't bother going to the internet with it", and then of course the email is never delivered because this provider handles web only and not mail. The web host company had to make some more-granular settings related to our DNS handling and then all these kinds of email issues, including the SilverStripe admin emails, were fixed.