An anonymous letter
An anonymous letter is a letter that does not bear the name of the writer. This type of letter typically conceals the writer's identity for various reasons such as privacy, fear of repercussions, or to create a sense of mystery.
A bad writer is called a Hack
modified-block
closing of the letter. It typically includes the sender's name or initials.
An addition to a letter written after the writer's name is called a postscript (P.S.). It is used to add additional information that was forgotten or deemed important after the initial message was written.
No Greg bear is NOT a teen fiction writer.
Adder (snake) Alligator Ant bear (anteater) Anteater
Writer's Identification
After the 'complimentary closing' (Sincerely, With Regards, Yours, etc.) there should be a space before your typed or printed name:Sincerely,What A. Writer
Grizzly Bear and Polar bear .
Writer's Identification
Bear would fit the bill nicely.
Correspondent