Find a large block of text somewhere on the internet, perhaps a paragraph or two, and then apply your font to that block of text. If your font has spacing and kerning problem, you will likely find it there.
BTW HypoTypo used Lincoln's Gettysburg Address to show a preview of his font. You can also do that. You can even use your original post for that.

Ok done, that was a misunderstanding on our side, sorry :/

Press CTRL+F5 to make a hard refresh of the preview... https://www.dafont.com/el-molaco.font

Ok

This is not possible again, because at dafont the kerning doesn't work between the alternate S and the a (when typing them manually)

https://www.dafont.com/saveya.font?text=%26%2357414%3Baveya&psize=l

... but what you can do is to make a special glyph with what you'd like to be displayed (with automatic ligatures)
Many authors do that, for example https://www.dafont.com/fr/yes-free.charmap
as you can see he designed the preview in the last glyph (U+E000) which is automatically displayed at dafont

PS. We validate this kind of thing only when it is not misleading for the users (when the separated glyphs exist alone, like in this font < and > for example)

It's the old preview that you had in cache, press CTRL+F5

It's the old preview that you had in cache, press CTRL+F5

I don't understand, what's the problem with Qarkine (the preview is like on your image)

For El Molaco we can't because the kerning doesn't work here... https://www.dafont.com/fr/el-molaco.font?text=El+Mo%26%23xe043%3Baco

Ok

PS. The way we put them online is not at all in a chronological order

Ok

(press CTRL+F5 to make a hard-refresh and see the difference, otherwise your browser may display the old image of its cache for a while)

The old school way that I set ascenders and descenders:

For the glyph frame which has the highest ascender, and the one with the lowest descender, I move the top and bottom bearings to the highest and lowest positions, then I create a tiny contour in the upper or lower corner where that X Axis position intersects with the Y Axis position for the right or left side bearing. I save the project file, then delete the tiny contours, and save again. To me, that's easier than calculating a numeric value.

Hello, I have no relation to dafont, but try checking in notepad / ms word

They should be online at next update (this week)

Ok, deleted from the pending submissions (it hadn't been reviewed yet)