The email to reference the correct site the file was imported into
clitools.wordpress.com is linked instead
Chrome 58.0.3029.110, Macintosh OS X 10.11.6

The replyto on the email is [email protected].
Two more users have also reported this issue:
More :)
Update: #3271374-t
Here's one more :D
3268646-t
3267120-t
3266484-t
Reported here:
https://en.forums.wordpress.com/topic/import-from-squarespace-9?replies=10#post-2974735
and here:
http://en.forums.wordpress.com/topic/import-notifications-to-wrong-url
I also searched my own email and found three instances of the wrong url. The oldest is May 30.
I'm currently doing some triage and realizing how many reports of this we're getting, including some concerned users that their import has gone wrong such as #3304179-t. It looks like something was imported into the site as there's an Italian post from a VIP user and a bunch of menu items that are making this site look extra bad.
cc @lancewillett for visibility/prioritization
Thanks @kriskarkoski , could you post on HG P2? I'm not going to be able to look before next week.
Heads up, I'm also not going to be able to look before next week.
More reports -
Another report in 874347-f
I just saw this issue after doing an import into a private test site that I own. (I started the import from the WP Admin WordPress importer rather than Calypso, but it looks like the same underlying issue.)
I got this one today also — testing out a WP import on https://wpcalypso.wordpress.com/settings/import/lancetest24.com
Success pane in Calypso:

Email:

This is fixed in r162387-wpcom.