[MlMt] removing previously used address

[Jason Davies]

One person I email daily originally gave me her gmail address and then 
her work one. By default when I email to her, her gmail address is 
supplied even though it's not in my address book any more. Mailmate 
seems to be remembering it.

Can I turn this behaviour off altogether as I'm not an 'auto-suggestion' 
fan? Failing that, can I remove this particular address? I can't see how 
it's stored...