system.mail.yml in Drupal 9

core/modules/system/config/install/system.mail.yml

3 string references to 'system.mail'

ContactPersonalTest::testSendPersonalContactMessage in core/modules/contact/tests/src/Functional/ContactPersonalTest.php

Tests that mails for contact messages are correctly sent.

InstallerExistingConfigTestBase::testConfigSync in core/tests/Drupal/FunctionalTests/Installer/InstallerExistingConfigTestBase.php

Confirms that the installation installed the configuration correctly.

MigrateSystemConfigurationTest::testConfigurationMigration in core/modules/system/tests/src/Kernel/Migrate/d7/MigrateSystemConfigurationTest.php

Tests that all expected configuration gets migrated.

File

core/modules/system/config/install/system.mail.yml

interface:
 default: 'php_mail'