You don't use ma'am because you say that verbally (verbally means actually saying it) and you say madam in a letters......
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Formal salutations are always followed by a colon. (Dear Sir Only in informatal writing do you use a comma. (Dear Sue,)
maam
"Mam" is not a word in English. The word you are thinking of is "Ma'am," which is short for "Madam." In the U.S. we use "Ma'am" primarily in speech. When you are talking to a lady, it is polite to use "Ma'am," especially in the South of the U.S. In writing a letter, "Madam" is formal and polite. If you are writing to a woman who is in an official position (e.g., a government official), you could start a letter with "Dear Madam." If you are writing to someone in a professional position and you are not sure if it is a man or a woman, you can say "Dear Sir or Madam." If you are addressing a group of people, the salutation is: Ladies: Gentlemen: Ladies and/or Gentlemen: (The word "Dear" is dropped.)
When you have written a formal letter, it is always important to finish it correctly. If the letter is to someone you have addressed by name at the top of the page, use 'Yours Sincerely', but if you have addressed them as Sir/Madam, or something similar, 'Yours Faithfully', shows a vouch of confidence in the person, which they will appreciate.
There really is no general rule as to what constitutes formal English. There really are many different types of English, depending on the setting (private letter, business letter, type of professional field, etc.). Generally, formal English means that you do not use any type of slang or colloquialism (no y'alls, 'sup, and whatnot), and you spell out words such as 'I am', instead of 'I'm', 'is not', instead of 'isn't, etc.In the case of a letter, formal English might also mean that you use formal wording when addressing the intended recipient ('Dear Sir/Madam', 'Sincerely').
it is not unusual to say "in fact," in a formal lettter
I'm a women and personaly I love it when a guy says maam to me. However there are a group of women who are usualywho want to be younger and calling them maam sometime offends them because it can be a sign of old age, like they think only the old people get called maam. But for the most part when you call a women maam they think how polite and thoughtfull, so go a head and use it, you'll get more happiness then ridicule.
One would use formal language in a business letter because it is a formal means of communication. When writing a business letter, one wants the tone to be professional. Formal language can help the writer to achieve this.
i would use a semi colon ; just because that is More formal.
use formal and semi-formal language
respected
Call the company and ask for the manager's name. Or, address the letter toDear Sir or Madam: (use colon : after Madam)To whom it may concern (really bad taste if you can get the name by phone)