No link since this was sent to me directly, sorry.
This was only the emails of the "VIPs" of Parler, like celebrities and influencers, not every user. That's why the email list is only around 300. It's not all the users.
This is the only news article I could find. Archive link because Daily Caller is a chud website.
https://archive.ph/PC3dl
This is the earliest tweet about the leak. I guess that the VIPs are similar to twitter's blue checkmark. It shows a screenshot of the email but the addresses are blurred out.
"Parler sent an email to all users with 300+ of their verified users CC'd instead of BCC'd"
https://twitter.com/AdamRy_n/status/1582046142707007494
Remember how the feds found most of the capital rioters because Parlor wouldn't scrub metadata from the photo
Me personally? No, I don't have them, a friend just sent me this image
We didn't even have time to start a pool for when the user data would be leaked this time.
I've seen two different copies of the list. It's possible they sent it in batches based on a limit of recipients somewhere.