You can address them as 'Sir' if they are a man, ' Miss' if you do not know if the lady is married or not, 'Madam' if you know the lady is married. If you are writing a letter, and you do not know the gender, you can address him/her as 'Dear Sir/Madam'. If you do not want to use any of the above, you may use 'excuse me'. Hope this answers your question :)
'Sir' or 'Mr. President' for a start, then 'sir' after that.
A baronet is addressed as "Sir", and his wife as "Lady". Exactly how to address the envelope is a little dicey , but "Sir John Doe and Lady Doe" would be acceptable, I would think.
Sir
"Dear Sir," is all you need to use.
In the military a male officer would be adressed as "sir" and a female oficer addressed as "ma'am" To address a female officer as sir would be a serious faux pas.The formal mode of address to a lady would be 'madam' oftenshortened to Ma'am. Some discretion should be used before addressing a lady as 'madam'. In some areas of society, the word madam may have dubious connotations
sir
The alternative way to address a formal letter when the recipient's gender is unknown is to use "To whom it may concern" instead of "Dear sir/madam."
You put in your address and instead of saying "Dear sir," you would say, "To whom it may concern"
Between the name and address of the recipient and the "Dear Sir" or Dear Mary"
Between the name and address of the recipient and the "Dear Sir" or Dear Mary"
When addressing a formal letter to someone whose gender is unknown, you can use the salutation "Dear Sir/Madam" to be respectful and inclusive.