disabling tls?

[Miles Fidelman]

A (hopefully) quick question: How does one disable TLS for a single 
destination?  (Yahoo has been exhibiting some funny problems with 
in-bound mail, and at least one person found that disabling TLS for 
yahoo servers was a work-around for them.)

Thanks very much,
Miles Fidelman

--
In theory, there is no difference between theory and practice.
In practice, there is.   .... Yogi Berra