Upgrade SwiftMailer to v6
Biggest change for us is that the previously deprecated mail-transport is dropped completely now. But that's for security-reasons.
#3 Updated by Markus Klein about 1 year ago
Summary from Slack discussion.
- Upgrade to v6 desired
- new default:
- sendmail if http://php.net/manual/en/mail.configuration.php#ini.sendmail-path is set
- otherwise smtp possibly taking http://php.net/manual/en/mail.configuration.php#ini.smtp into account
- silent upgrader can switch transport from mail to the new default