fix: email TLD can be longer than 3 chars

[SanketD92]

Issue #, if available:
#926

Description of changes:
Increasing TLD limit to allow more valid cases.

Checklist:

• Have you successfully deployed to an AWS account with your changes?
• Have you written new tests for your core changes, as applicable?
• Have you successfully tested with your changes locally?

AS review ticket id:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #928 (7702bb6) into develop (1465431) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #928   +/-   ##
========================================
  Coverage    51.43%   51.43%           
========================================
  Files          295      295           
  Lines        16787    16787           
  Branches      2596     2596           
========================================
  Hits          8634     8634           
  Misses        7166     7166           
  Partials       987      987           

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