m (Tom Hutchison moved page Contact Form Fatal Error to J2.5:Contact Form Fatal Error without leaving a redirect: maybe better here)
There is a fatal error when sending the contact form.
Parse error: syntax error, unexpected 'return' (T_RETURN), expecting function (T_FUNCTION) in /.../components/com_contact/controllers/contact.php on line 172
A bug introduced.
Update to the latest maintenance version, which is currently 2.5.28 for the 2.5 series.