An adjective clause tells something about the noun or pronoun in the sentence. It provides some of the required information which is essential for the sentence. An adjective clause begins with relative pronouns or relative adverbs. They provide additional information. A subject and a verb is a part of an adjective clause. In the above sentence, 'that is mailed today' is the adjective clause.
Explanation:I would write about benefits, like job offers and stuff like that and experiences you have in college, also like things you can study about in college. Hope this helps!!