A zoom lens includes, in order from the object side to the image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a rear group including one or more lens units. The catalyst comprises a molecular sieve having 10 membered rings with channels of limited length. The invention makes it possible to acquire and print out a file attached to an e-mail when it cannot be received directly due to the capacity limit of the mail server by obtaining it from the transmission source or from another transmission destination. Moreover, the relay assembly includes a resin plate to which the relays and the service plug are attached, and these relays are electrically connected to the service plug via buses on the resin plate.