Is email application configured to reject connections to servers that do not support RFC 5746? [not relevant]
I cannot send email by an unpatched smtp server of my ISP that do not support RFC 5746 (i.e. still suffers the security issue CVE-2009-3555; laptop version of Mozilla Thunderbird tells me this).
Edit: Sorry, this question was not valid anymore. The problem I described does not exist anymore (My colleague suffered it while using one of the earliest updates more than a year ago). Edit2: please, close the question.