Honourable Mr?

First, let me thank you for this great service.

I have two questions to ask.
When refering to a person can we correctly say The Honourable Mr ....?
And what is the correct salutation (in letters) for a person addressed The Honourable (Mr)...?

Thank you.

[RonBee]

The term "Honorable" is usually reserved for people like ambassadors. For most people it is sufficient to say "Mister".

8)

[Tdol]

'Honourable' is not used for ordinary people in British English. We use it for members of parliament, who call each other 'my honourable friend' when speaking in the British parliament.