Look --
That is exactly what I have done for you. Told you how to do the job.
A - you have to make changes to the php.ini [mail_function] section that match the delivery method - so you have to learn what that function does.
In those posts I gave the exact syntax to be used (in most cases)
sendmail_path = "C:\xampp\sendmail\sendmail.exe -t"
B. - you will need an MTA (Mail Transfer Agent) that 'pushes' mail to a mail server -- that would be c:\xampp\xampp\sendmail.exe. [as I explained twice already in this thread - although you were hell bent on running Mercury and didn't want a third party solution, remember?]
and that MTA has to be configured to match your environment. And I gave a complete example of how make the changes to sendmail.ini with your ISP e-mail account. I didn't write any of this software, package it or prepare the non-existent documentation, I am sharing my experience.
I can't do a remote Vulcan Mind Meld and guess what your arrangements for e-mail are or why you chose to do them that way.
So you know, this is a volunteer effort I make here (as well as on two other Open Source projects), I have no formal connection with this project. If you want, I will do the work for you at my customary hourly rate. Should I Google for tutorials for you as well?
How do you think I learned all this stuff? Searching, reading and testing... You have to invest the effort to learn things, that is the only way they have value.
If you make the effort, you will find the results satisfying and rewarding -- because YOU did it.
Peace and Good Luck