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Re:Instead of deleting account, NYT appends ‘1000’ to userna... by avian on Tuesday April 28, 2020 @07:07AM (#23005787)
One possible way I can think of is they're hosting their own mail server and route messages for all unknown addresses to some mailbox (not that uncommon as far as I know - people do that to avoid bouncing mails with a typo in the address).

With such a setup it would be possible to notice that NYT mail started coming to foo1000@... instead of foo@... after requesting account deletion. Username change could also be evident directly from the mail, or it was a trivial guess.

Re:Instead of deleting account, NYT appends ‘1000’ to userna... by heyoni on Tuesday April 28, 2020 @08:41AM (#23006399)
He’s saying they append 1000 to the user and domain.

/edit I was wrong. It’s the user and email. Your theory would work

Re:Instead of deleting account, NYT appends ‘1000’ to userna... by gruez on Tuesday April 28, 2020 @08:59AM (#23006509)
>/edit I was wrong. It’s the user and email. Your theory would work

Why? My interpretation of "append 1000 to email" is that 1000 gets added to the very end, not the local part.