Fix isEmail rejecting UTF-8 in quoted local part when disabled

[harsh-parakh22]

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)
• References provided in PR (where applicable)

[harsh-parakh22]

Fix isEmail rejecting UTF-8 in quoted local part when disabled

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (784e52a) to head (c7a0c3b).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2655   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          114       114           
  Lines         2572      2574    +2     
  Branches       651       652    +1     
=========================================
+ Hits          2572      2574    +2     

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