Discover if the mail servers for red21.es can be reached through a secure connection.
To establish a secure connection a mail server has to offer STARTTLS (SSL), a trustworthy SSL certificate, support for the Diffie-Hellman-Algorithm to guarantee Perfect Forward Secrecy and must not be vulnerable against the Heartbleed attack. Futhermore we recommend using end-to-end encryption with GnuPG.
Report created Thu, 23 Jun 2022 15:10:57 +0000
Please contact the operator of red21.es and ask him or her to solve this problem. This result stays accessible under the following address:
These servers are responsible for incoming mails to @red21.es addresses.
|Hostname / IP address||Priority||STARTTLS||Certificates||Protocol|
We have not received any emails from a @red21.es address so far. Test mail delivery