9 files declare their use of EmailValidator in Zircon Profile 8

AgainstFilterVar.php in vendor/egulias/email-validator/tests/egulias/Performance/AgainstFilterVar.php

AgainstOldIsemail.php in vendor/egulias/email-validator/tests/egulias/Performance/AgainstOldIsemail.php

ContactFormEditForm.php in core/modules/contact/src/ContactFormEditForm.php

Contains \Drupal\contact\ContactFormEditForm.

DomainPart.php in vendor/egulias/email-validator/src/Egulias/EmailValidator/Parser/DomainPart.php

EmailAction.php in core/modules/action/src/Plugin/Action/EmailAction.php

Contains \Drupal\action\Plugin\Action\EmailAction.

EmailValidatorTest.php in vendor/egulias/email-validator/tests/egulias/Tests/EmailValidator/EmailValidatorTest.php

LocalPart.php in vendor/egulias/email-validator/src/Egulias/EmailValidator/Parser/LocalPart.php

Parser.php in vendor/egulias/email-validator/src/Egulias/EmailValidator/Parser/Parser.php

UpdateSettingsForm.php in core/modules/update/src/UpdateSettingsForm.php

Contains \Drupal\update\UpdateSettingsForm.