At the moment the settings on Joomla config show the mailer is PHP mail function and the sendmail path is /usr/sbin/sendmail.
Hi, JWIG
I'm using Joomla 1.59 and have the same settings as use (PHP mail function, sendmail path /usr/sbin/sendmail); I've also filled in the "mail from" with an email address and "from name" - and it seems to be able to send mail... I logged into the system last night and used one of the comment fields to successfully send a message to myself, so it seems to be working.
I wonder if the problem is with your forms? I haven't used "Chronoforms" before - does it use the Joomla mail handling facilities or does it have its own? If you've got a contact set up in Joomla (I have a "contact Webmaster" menu item that just uses the standard "Contact Layout"), you might want to try sending mail from a "Joomla contact" form to try to troubleshoot it...
I'm not a Joomla expert so can't really point you where to look other than this. Perhaps the Joomla support forums?
Al