configuration DNS cache pre-population 1st class error handling auto-gzip compression timeout management public key pinning progress callback extended info request abort HTTP/2-push IDN support Psr18Client time stats streaming base URI ...
$body = new TextPart('Some content'); $headers = (new Headers()) ->addMailboxListHeader('From', ['fabien@symfony.com']) ->addMailboxListHeader('To', ['fabien@sensiolabs.com']) ->AddTextHeader('Subject', 'Some subject') ; $email = new Message($headers, $body); And you get full control!