Email validation allows deprecated email addresses

Sitenotes:
- Actually I don't understand the reason why it's not allowed to pass other validators into the `isValid` method.
- Maybe it's a good idea to make the validator configurable in the mailer settings?

Differences between the validators found in my research:
RFCValidation:
Validates email addresses according to RFC 5322, including some edge cases and deprecated features, such as:
Quoted strings
Folding white space (FWS)
Comments
Space before the @ (technically valid per RFC but rarely supported)
This validator returns emails as valid even if they include unusual but technically RFC-compliant formats. It may emit warnings, which are important if you want to avoid deprecated or problematic formats.

NoRFCWarningsValidation:
This is a stricter validator. It still uses RFC rules, but any format that triggers an RFC warning—like a space before @—is considered invalid.

#3061074: egulias/EmailValidator prior to 2.1.22 allows addresses with a space in the domain part → suggests this was previously fixed for some other case.

Can we get a test showing this problem

I have tested this locally and encountered the following issue:

Configuration: /var/www/html/core/phpunit.xml.dist

F                                                                   1 / 1 (100%)

Time: 00:10.017, Memory: 4.00 MB

There was 1 failure:

1) Drupal\Tests\Core\Recipe\RecipeQuickStartTest::testQuickStartRecipeCommand
Failed asserting that ' 0/16 [░░░░░░░░░░░░░░░░░░░░░░░░░░░░]\n
Installing Drupal\n
\n
 5/16 [▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░░░░░░░]\n
Set up database\n
\n
 7/16 [▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░░░░░░]\n
Set up database\n
\n
10/16 [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░░░░░░░░░░]\n
Configure site\n
\n
In install.core.inc line 980:\n
                                                                                                                  \n
  The email address <em class="placeholder">drupal@localhost</em> is not valid. Use the format user@example.com.  \n
  The email address <em class="placeholder">admin@localhost</em> is not valid. Use the format user@example.com.   \n
                                                                                                                  \n
\n
quick-start [--langcode [LANGCODE]] [--password [PASSWORD]] [--site-name [SITE-NAME]] [--host [HOST]] [--port [PORT]] [-s|--suppress-login] [--] [<install-profile-or-recipe>]\n
\n
' [UTF-8](length: 1108) contains "Congratulations, you installed Drupal!" [ASCII](length: 38).

/var/www/html/core/tests/Drupal/Tests/Core/Recipe/RecipeQuickStartTest.php:119

FAILURES!
Tests: 1, Assertions: 2, Failures: 1.

Thank you for your feedback.
I've now added the following assertion to cover the invalid email case with a space:
$this->assertFalse($validator->isValid('example @example.com'));
Please let me know if any further changes are needed.

Thnk a last step would be to get a CR written as this could be a behavior change for some