Debian Configuration :: OpenSSL ECDSA Certificate Does Not Work

I've been trying to get an ECDSA certificate to work for my postfix installation, however, it seems that when I try to use the aECDSA protocol with a client the server gives "no shared cipher" errors.

I had created the certificate like so:

Code: Select allopenssl ecparam -name secp521r1 -genkey -param_enc explicit -out private/ec-email-server.pem
openssl req -new -x509 -key private/ec-email-server.pem -out certs/ec-email-server.pem -days 365

So I've setup a test server, and connected to it with a test client like the following:

Code: Select allopenssl s_server -accept 123 -cert /etc/ssl/certs/ec-email-server.pem -key /etc/ssl/private/ec-email-server.pem
openssl s_client -connect localhost:123

However, once again, I get "no shared cipher" errors.