"important correspondence" is a correct and usable phrase in written English.
You can use this phrase to refer to significant or meaningful letters, emails, or other written communication. Example: I have been working on responding to important correspondence from clients all day.
But evidence from academic and central departments suggested that a large percentage of students did not do this – and important correspondence was often missed.
Nevertheless, we did find an interesting and important correspondence between the metabolomic data and trancriptomic data.
Esakia (1981) proved an important correspondence: he showed that a topological space satisfies the axiom GL if and only if the space is scattered.
It provides a graphical representation of the relationship between two categorical variables via an examination of how classes load onto important correspondence axes.
There is in addition Humboldt's important correspondence with the second founder of American linguistics, John Pickering (1777 1846) who wrote a lengthy article on the American Indian languages for Francis Lieber's Encyclopedia Americana where specific reference is made to Humboldt's work (see Pickering 1831).
Cantor also began another important correspondence, with Gösta Mittag-Leffler in Sweden, and soon began to publish in Mittag-Leffler's journal Acta Mathematica.
More important, its correspondence network made geography irrelevant.
(I confess that this is also my method for writing thank-you notes and other important personal correspondence).
"He trusts Kirsty and she is best-placed to cast a discreet eye over important handwritten correspondence when required".
He was a "strong" president in the conduct of foreign policy, writing most of the important diplomatic correspondence of his government and making all important decisions himself.
Leibniz's relations with Ernst August and Georg Ludwig were not as amicable as his relations with his original employer, but he was close to Sophie, the wife of Ernst August and youngest sister of Princess Elisabeth of Bohemia, with whom Descartes had an important philosophical correspondence.
