[GTALUG] accessing smtp server with weak dh encryption?

Hi, I use the u of t smtp servers for outgoing mail from my laptop, including some automated mails that I send out. Postfix's sendmail will no longer complete the TLS handshake with the server, because the U of T server hasn't been updated to fix the logjam attack (still using a 512kb temporary key). Current thunderbird breaks, too, though if I use an old version I can still get mail out. Does anyone know if there's any way to instruct postfix (or is it maybe openssl) to violate protocol and permit me to interact with this server? I know there are security risks but I'm kind of screwed if I can't send out mail. Thanks, matt