[CentOS] Disable SSLv3 in sendmail in CentOS 5

[Paul Heinlein]

On Thu, 16 Apr 2015, Andrew Daviel wrote:

> RedHat released sendmail-8.13.8-10.el5_11.src.rpm which includes 
> sendmail-8.13.8-ssl-opts.patch which adds support for disabling 
> SSLv3 and SSLv2 in sendmail.cf
>
> But as far as I can see there is no support in sendmail.mc - I can't 
> see how to compile sendmail.mc to get the required line 
> ServerSSLOptions in sendmail.cf
>
>
> Does anyone know how to do this ?

At the end of sendmail.mc, after the MAILER macros, add a 
LOCAL_CONFIG, e.g,,

LOCAL_CONFIG
O ClientSSLOptions=+SSL_OP_NO_SSLv2 +SSL_OP_NO_SSLv3
O ServerSSLOptions=+SSL_OP_NO_SSLv2 +SSL_OP_NO_SSLv3 +SSL_OP_CIPHER_SERVER_PREFERENCE

-- 
Paul Heinlein
heinlein at madboa.com
45°38' N, 122°6' W