According to your description, there are several ways to start:

1. Dearsier/madam can be used as the starting point if you don't know who the other party is at all;

2. Write to a committee or an office, starting with DearXXX committee/organization/office;

3. To write to a teacher or a work agent, you can start with DearProfessorXX/DearSir/DearSirs.

Extended materials:

English email format?

Dear Polly,?

This is Mary.....?

Look forward to seeing you soon.?

Best regards,?

Mary Yu?

(Each line above, or each paragraph, is left-aligned)?

first, the theme?

the contents of the Subject box should concisely summarize the contents of the letter, which can be a short word, such as greetings；; The long one can be a noun phrase or a complete sentence, but the length is generally not more than 35 letters. ? The content of the subject box should not be ambiguous. ? Generally speaking, as long as the words and proper nouns at the beginning of a sentence are capitalized. Another more formal format can capitalize the first letter of every word except prepositions, conjunctions or articles with less than 5 letters. ?

second, the title?

1. E-mail generally uses informal style, so Salutation before the Body usually does not need to use expressions such as Dear Mr. John. You can call your peers, friends and colleagues by their first names, but it is best to use titles and surnames for elders or superiors. ?

2. Generally, there is a blank line between the salutation and the body, between paragraphs, and between the body and the greeting at the end of the letter, and there is no need for a space at the beginning.

3. If there is no name, or it is a very formal letter, you can consider these:?

Dear Committee Member:?

Dear Meeting Planner:?

To Whom It May Concern:?

third, the last part?

A, pay attention to the greetings at the end of the letter, and choose words only when you understand the relationship between everyone.

1. Very Formal is very formal (for government officials, for example)?

Respectfully yours, Yours respectfully,?

2. Formal (for example, between customer companies)?

Very truly yours, Yours very truly, Yours truly,?

3. Less Formal is not formal (such as customers)?

Sincerely yours, Yours sincerely, Sincerely, Cordially yours, Yours cordially, Cordially,?

4. Informal is informal (such as friends and colleagues)?

Regards, Warm regards, With kindest regards, With my best regards, My best, Give my best to Mary, Fondly, Thanks, See you next week!

B. Courtesy close at the end of a letter is usually concise. Often only one word is needed, such as' Thanks',' Best' and' Cheers', instead of' Sincerely yours' or' Best regards' in general letters. ?

C. signature: don't sign Mr., Ms., Mrs. and Dr. together.