Opportunistic TLS on mail servers

[steve.dake () gmail com]

I am curious as to how may people have their email servers configured to perform opportunistic TLS? It seems like a 
cheap way to mitigate a good portion of your potential email information leakage. If you are against it, I would like 
to know why. If you have used it for a while, have you had any issues?

Just interested in what everyone has to say about the topic.

Article:
http://securityn00dle.blogspot.com/