Mixed punctuation actually means that you add a colon to the end of a salutation in your documents. Open means you do not add a colon; for example:
Dear Susie
Thanks for calling!
Whereas for mixed punctuation:
Dear Susie:
Thanks for calling!
open punctuation is used in types of business letters. In a business letter you may address the letter, but instead of putting somthing like San Diego, California, you would put SAN DIEGO CALIFORNIA. there is no puctuation used in the address and it is in all caps.
A comma should follow the closing if there is a colon following the salutation.
An apostrophe is not a letter. It falls into the punctuation category.
Open
a comma
After the salutation of a business letter, the correct punctuation to use is a colon.
What is letterhead
No punctuation marks come after The.
open punctuation is used in types of business letters. In a business letter you may address the letter, but instead of putting somthing like San Diego, California, you would put SAN DIEGO CALIFORNIA. there is no puctuation used in the address and it is in all caps.
The main difference between a social letter and a business one is that a social letter has a more friendly tone. Business letters are usually more professional in tone and style.
None, open punctuation means there is no punctuation after the salutation or the complimentary close.
A personal-business letter is one that is sent from an individual to a business or company. Whereas, a business letter is a letter sent by the company or organization.
A comma
It is used in business letters.
After the word "enclosure" at the end of a business letter, you would typically include a colon or a comma.
a colon
A personal business letter is wriiten in a formal tone to convey a message in a professional manner. A normal business letter is a letter from one company to another or between there organazation and their customers.