Mail server (General)
Hi Strange,
Too many questions regarding the failing of sending e-mails (such as contact form, registration activation..etc) ...
The forum uses the mail() function to send e-mails. If mails cannot be sent by the forum there's probably no mail server available.
For some server configurations an additional parameter is required. This can be set in Forum settings --> Advanced settings --> mail_parameter (you may need to ask your hosting provider for this information).
Alex