Cannot send mails with special characters in local part
Currently it is impossible to send mails with special characters in their local part, e.g.
john.lötzsch@example.org. Swiftmailer fails with the following error:
[ Swift_RfcComplianceException ] Address in mailbox given [john.lötzsch@example.org] does not comply with RFC 2822, 3.6.2. thrown in file er/lib/classes/Swift/Mime/Headers/MailboxHeader.php in line 345