6 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.
InstallerExistingConfigSyncDirectoryMultilingualTest::testConfigSync in core/tests/Drupal/FunctionalTests/Installer/InstallerExistingConfigSyncDirectoryMultilingualTest.php
Confirms that the installation installed the configuration correctly.
InstallerExistingConfigTestBase::testConfigSync in core/tests/Drupal/FunctionalTests/Installer/InstallerExistingConfigTestBase.php
Confirms that the installation installed the configuration correctly.
MailDsnSettingsUpdateTest::testSystemPostUpdateMailerDsnSettings in core/modules/system/tests/src/Functional/Update/MailDsnSettingsUpdateTest.php
Tests system_post_update_mailer_dsn_settings().
MigrateSystemConfigurationTest::testConfigurationMigration in core/modules/system/tests/src/Kernel/Migrate/d7/MigrateSystemConfigurationTest.php
Tests that all expected configuration gets migrated.
system_post_update_mailer_structured_dsn_settings in core/modules/system/system.post_update.php
Add new default mail transport dsn.

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