If you want to set up a mirror of the PuTTY website, go ahead and set one up. Please don't bother asking us for permission before setting up a mirror. You already have permission.
If the mirror is in a country where we don't already have plenty of mirrors, we may be willing to add it to the list on our mirrors page. Read the guidelines on that page, make sure your mirror works, and email us the information listed at the bottom of the page.
Note that we do not promise to list your mirror: we get a lot of mirror notifications and yours may not happen to find its way to the top of the list.
Also note that we link to all our mirror sites using the rel="nofollow"
attribute. Running a PuTTY mirror is not intended to be a cheap way to gain search rankings.
If you have technical questions about the process of mirroring, then you might want to mail us before setting up the mirror (see also the guidelines on the Mirrors page); but if you just want to ask for permission, you don't need to. You already have permission.