correspondence, correspondents

Correspondence or correspondence means an exchange of letters or emails, or the letters themselves--
His firm plans to publish the correspondence of the famous author.
Their correspondence doesn't mention the sale of any property.

Correspondence also means agreement; similarity--
There seems to be little correspondence between what he says and what he does.
The correspondence between the two sets of data is obvious.

Correspondents or correspondents ( rhymes with correspondence ) is the plural ( more than one ) of "correspondent", meaning one party to an exchange of letters or mail, including a business partner or reporter--
The correspondents wrote to each other for decades, but they never met in person.
They are both foreign correspondents for a New York newspaper.

Now that you know that, you can say--
"The correspondents threatened to sue if the publisher printed their correspondence."