Rule reminder
Affirmative imperative + double pronoun: ALWAYS attach to end of verb. Tu: Dammelo! (Give it to me!), Mandagliela! (Send it to him/her!). Voi: Datecelo! (Give it to us!), Mandateglielo! (Send it to them!). The pronoun cannot go before the imperative.
Come si dice 'Send it to them!' (il pacco) — voi imperative?