I have successfully installed XAMPP with MercuryMail running, etc. I can send to "firstname.lastname@example.org" via a PHP script but attempts to use FormMail.pl to send mail to the same user yields:
An error has occurred in the program
failed to get remote address from [::1], so can't send traceable email at (eval 61) line 39.
The formmail is being "activated" by pressing a SUBMIT button on an HTML form. I have successfully used formmail.pl on an actual website
so it's not like I can't get it to run at all. Apparently/obviously the difference is my attempts to use it through XAMPP and "localhost".
I am sure the problem is simple enough but it's now late, I am tired.