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[Mahara Bot <1714082@xxxxxxxxxxxxxxxxxx>]

Patch for "master" branch: https://reviews.mahara.org/10037

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https://bugs.launchpad.net/bugs/1714082

Title:
  The user's primary email address is not checked in a case insensitive
  way

Status in Mahara:
  Confirmed

Bug description:
  Currently you can create 2 users, via the Admin -> Users -> Add user
  screen, with this:

  username: Test one   email: UserA@xxxxxxxxxxx
  username: Test two   email: usera@xxxxxxxxxxx

  but not another user with

  username: Test three   email: usera@xxxxxxxxxxx

  As it complains the email address 'usera@xxxxxxxxxxx' is used

  However, with email addresses the domain part is case insensitive and
  only the username part is case sensitive - yet saying that most email
  servers treat the username part also as case insensitive to avoid
  email delivery confusion - see https://www.lifewire.com/are-email-
  addresses-case-sensitive-1171111

  To also avoid confusion within Mahara we should limit the primary
  email address to be case insensitive unique.

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