Hello.

"I uses gmail" - is not the best option. I recommend using email with your own domain.

"I uses xampp server and run my server from my own machine." - this is also not a very good option. It would be better to use professional shared hosting.

But here is a video (https://aleksius.com/en/joomla-cms/how-to-build-a-website-from-scratch-for-free#video-tutorial) in which I showed how you can use Google mail to send letters from the site. In the video you will see Joomla. But the principle is the same for Website X5.

Mail settings can be added here:

If this doesn't help also read this https://meetanshi.com/blog/send-mail-from-localhost-xampp-using-gmail/