Log in as admin
Go to manage users > bulk email search
Search for an email address with different capitalisation than appears in the account records (eg if the email address is email@example.com, search Foo@ao3.org)
The result will say "1 emails searched. 0 found. 1 not found." and list the email address that you searched (eg Foo@ao3.org), but below that section will be displayed the account with the differently punctuated email address (firstname.lastname@example.org)
Download the CSV output
Open the CSV output in your preferred program
It will have an entry for "both" email addresses, one with an account next to it, one without.
What I expect to happen:
I would expect it to ignore capitalisation altogether, and just return that it found the email address I searched, and list it once in the csv.
Please also test that:
the “Not found” header does not display when all results are found
the text under the field where you enter the email addresses no longer mentions “URLs”