Path link doesn't work in mail body

If I copy and paste a path address from explorer to mail body, EM client doesn’t recognize it like a link, while other mail clients do.
Moreover when my colleagues receive the mail (they use outlook) if there are one or more spaces inside the path address the link is broken

Some example:
\server\folder1\folder2
outlook users see the link, I don’t at all.

\server\folder 1\folder 2
outlook users see a broken link till the first space, I don’t at all.

If an outlook user replies to my mail or send me a path link, I see that as link like outlook users.
So is a problem of formatting outcoming mail I suppose.

Sorgent of the original mail
\server\folder 1\folder 2

Sorgent of the reply from outlook user
<a href=3D"file://server/folder">\server\folder1/folder 2

How should be
<a href=3D"file://server/folder">\server\folder 1/folder 2