Issue #3257731: Fix composer.json file for the Symfony Mailer module name to symfony_mailer

Closes #3257731

added 7 commits

• 6bfafadf...0c9813ac - 6 commits from branch project:1.x
• 27bdcde2 - Issue #3257731: Fix composer.json file for the Symfony Mailer module name to symfony_mailer

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merged