Indirect object pronoun

Indirect object pronoun
 

In the following sentence: Si, yo le envio cosas a mi amigo todo el tiempo.

Is the indirect object pronoun "le" needed along with indirect object "a mi amigo"? Is it common to include the indirect object pronoun when there's an indirect object in the sentence?

Yes, including "le" or "les" is both common and normal.

When both are present the usual analysis is that "le/les" is the indirect object, and "a mi amigo(s)" or "a usted(es)" merely clarifies to whom "le/les" refers.

This is almost automatic when the indirect object is part of the context of the conversation, particularly when there are other potential third-person indirect objects within the context.