TLS negotiation fails when IMAP server presents ECC certificate

[Seth]

environment:
Client-
Freya 3.4.2
pantheon-mail 0.10.0
Server-
Dovecot 2.2.23
Libressl 2.2.6

pantheon-mail fails to connect when the server is using a ECC (Eliptic Curve Cryptography) certificates.

error message that appear in the dovecot log when pantheon-mail tries to connect is:
Error: SSL: Stacked error: error:1408A0C1:SSL routines:SSL3_GET_CLIENT_HELLO:no shared cipher

Please add support to pantheon-mail for ECC certs!

The History and Benefits of ECC Certificates
https://www.digicert.com/ecc.htm

Reasons you might want to use ECC/ECDSA certs
https://blog.cloudflare.com/ecdsa-the-digital-signature-algorithm-of-a-better-internet/

Related Dovecot mailing list thread
http://www.dovecot.org/list/dovecot/2011-October/061487.html