[CentOS] TLS for all CentOS websites but not for smtp?

Hello everybody,
I just got the email about the enforcing of HTTPS for the CentOS Websites
which I really appreciate:

„The CentOS Project infra team has decided to implement TLS wherever we
 can (…)”

Does anybody know if and when mail.centos.org will be able to deliver its
mails with STARTTLS? There seems to be no support for STARTTLS at all:

$: openssl s_client -connect mail.centos.org:25 -starttls smtp
 (…)
 didn't found starttls in server response, try anyway...