I suppose that you can use the verb "contact" either as a transitive verb and follow it with an object or as an intransitive verb with a preposition "with". In both cases you need to specify with whom you're going to contact.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
tashiroCan "those" be removed from "I will contact those who e-mailed within this week" ?No. You must not remove "those"!