When sending e-mail my server process crashes

I just implemented Braintree and now whenever I send an e-mail my server crashes with the following in the logs (also happens when I completely disable Braintree). I am stumped. I am on METEOR@ with email@1.1.18. When I unset MAIL_URL this does not happen.

      throw er; // Unhandled 'error' event
Error: read ECONNRESET
    at exports._errnoException (util.js:911:11)
    at TLSWrap.onread (net.js:558:26)
=> Exited with code: 1