Racker Hacker

Disabling SSLv2 in Dovecot is relatively easy:

ssl_cipher_list = ALL:!ADH:!LOW:!SSLv2:!EXP:+HIGH:+MEDIUM

# openssl ciphers -v 'ALL:!ADH:!LOW:!SSLv2:!EXP:+HIGH:+MEDIUM'
DHE-RSA-AES256-SHA SSLv3 Kx=DH Au=RSA Enc=AES(256) Mac=SHA1
DHE-DSS-AES256-SHA SSLv3 Kx=DH Au=DSS Enc=AES(256) Mac=SHA1
AES256-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA1
DHE-RSA-AES128-SHA SSLv3 Kx=DH Au=RSA Enc=AES(128) Mac=SHA1
DHE-DSS-AES128-SHA SSLv3 Kx=DH Au=DSS Enc=AES(128) Mac=SHA1
AES128-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(128) Mac=SHA1
KRB5-DES-CBC3-MD5 SSLv3 Kx=KRB5 Au=KRB5 Enc=3DES(168) Mac=MD5
KRB5-DES-CBC3-SHA SSLv3 Kx=KRB5 Au=KRB5 Enc=3DES(168) Mac=SHA1
EDH-RSA-DES-CBC3-SHA SSLv3 Kx=DH Au=RSA Enc=3DES(168) Mac=SHA1
EDH-DSS-DES-CBC3-SHA SSLv3 Kx=DH Au=DSS Enc=3DES(168) Mac=SHA1
DES-CBC3-SHA SSLv3 Kx=RSA Au=RSA Enc=3DES(168) Mac=SHA1
DHE-DSS-RC4-SHA SSLv3 Kx=DH Au=DSS Enc=RC4(128) Mac=SHA1
KRB5-RC4-MD5 SSLv3 Kx=KRB5 Au=KRB5 Enc=RC4(128) Mac=MD5
KRB5-RC4-SHA SSLv3 Kx=KRB5 Au=KRB5 Enc=RC4(128) Mac=SHA1
RC4-SHA SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=SHA1
RC4-MD5 SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=MD5