Yes...
Address the Governor General or his or her spouse as "Excellency" or "Your Excellency" first, then as "Sir" or "Madame" as is gender appropriate thereafter.
Her Excellency
your Excellency
An ambassador is addressed as His Excellency or Her Excellency, unless they have a royal title. In the case of a royal title, it can be the ambassador who determines their preferred form of address.
The Governor General of Jamaica is addressed directly as 'Your Excellency' and indirectly as 'His Excellency the Governor General'
no i think alright guvnor will do
The spouse of the Governor General is Her Excellency Ms. Sharon Johnson, C.C.; she should be addressed in writing as "Excellency," and you should close with "Yours Sincerely." In person, she should be addressed as "Your Excellency" when you meet, and then on subsequent occasions as "Madam."
The Governor General of Canada should be initially addressed in conversation as Your Excellency (or simply Excellency), and subsequently as Ma'am (or Sir, in the case of a male governor general).
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Dear Excellency as a greeting in writing, Your Excellency when speaking TO him, and His Excellency when writing or speaking OF him.
Your Excellency: When written at the beginning, it's Dear[ no His OR Your ] Excellency. In the body of the letter , it's Your Excellency.