Le enviaré el documento a mi profesora mañana.

Because le is the indirect object pronoun, and in Spanish it is very common to repeat the indirect object this way.

• le = to her / to him / to you (formal)
• a mi profesora makes it clear who that le refers to

So Spanish often uses both:

• Le enviaré el documento a mi profesora. = I’ll send the document to my teacher.

This is not considered redundant in the way it often would be in English. In Spanish, it sounds natural.

Here, le means to her.

In this sentence:

• el documento = the thing being sent → the direct object
• mi profesora = the person receiving it → the indirect object

So:

• le = to her
• enviaré = I will send

Together:

• Le enviaré... = I will send her... / I will send to her...

Because a is used for the recipient of the action: the person something is sent to.

• enviar algo a alguien = to send something to someone

So:

• enviaré el documento a mi profesora = I’ll send the document to my teacher

para usually means for, and it often expresses purpose, benefit, or intended destination, not the grammatical recipient in this kind of structure.

So with enviar, Spanish normally uses:

• a alguien

not:

• para alguien in this meaning

Enviaré is the simple future of enviar and means I will send.

It is formed by taking the full infinitive and adding future endings:

• enviar
• enviar + é → enviaré

Future endings are:

• -é
• -ás
• -á
• -emos
• -éis
• -án

So:

• enviaré = I will send
• enviarás = you will send
• enviará = he/she will send

Unlike English, Spanish often builds the future into a single word rather than using a separate will.

The accent mark in enviaré shows the correct stress.

Without going too deeply into spelling rules, the accent tells you that the stress falls on the final syllable:

• en-via-RÉ

This accent is part of the standard written form of the future tense ending -é.

Compare:

• enviaré = I will send
• enviare would be incorrect here

Because el documento is a thing, not a person.

Spanish uses the personal a mainly before specific people (and sometimes pets or personified beings) when they are direct objects.

Examples:

• Veo a mi profesora. = I see my teacher.
• Veo el documento. = I see the document.

In your sentence:

• el documento is the direct object, but it is an object/thing
• so there is no personal a

Yes, mañana can move around. Spanish word order is flexible.

All of these are possible:

• Le enviaré el documento a mi profesora mañana.
• Mañana le enviaré el documento a mi profesora.
• Le enviaré mañana el documento a mi profesora.

They all mean basically the same thing: I’ll send the document to my teacher tomorrow.

The version you have is very natural. Putting mañana at the end is common and neutral.

In Spanish, possessive adjectives like mi, tu, su usually come before the noun:

• mi profesora = my teacher

This is the normal, everyday way to say it.

The form la profesora mía does exist, but it is less neutral and usually adds emphasis, contrast, or a different tone. A learner should generally use:

• mi profesora

Yes. That is also correct.

There are two very common ways to talk about the future in Spanish:

1. Simple future

   • Le enviaré el documento...
   • I will send the document...

2. ir a + infinitive

   • Voy a enviarle el documento...
   • I’m going to send the document...

Both are natural. Very roughly:

• voy a + infinitive often feels a bit more immediate or conversational
• simple future can sound slightly more neutral, formal, or written, though it is also very common in speech

Spanish object pronouns can appear in different places depending on the verb form.

With a conjugated verb, the pronoun usually goes before:

• Le enviaré el documento.

With an infinitive, it can attach to the end:

• Voy a enviarle el documento.

With voy a + infinitive, both are often possible:

• Le voy a enviar el documento.
• Voy a enviarle el documento.

So in your sentence, le enviaré is correct because enviaré is a conjugated verb.

Neither in form. Le is used for both masculine and feminine indirect objects.

So:

• Le enviaré el documento a mi profesora. = I’ll send the document to her
• Le enviaré el documento a mi profesor. = I’ll send the document to him

That is why Spanish often includes a mi profesora / a mi profesor to clarify who le refers to.

Yes. The direct object el documento can become lo.

So:

• Le enviaré el documento a mi profesora. can become
• Se lo enviaré a mi profesora.

Why se lo and not le lo? Because Spanish changes le/les to se when it comes before lo/la/los/las.

So:

• le + lo → se lo

That gives:

• Se lo enviaré a mi profesora. = I’ll send it to my teacher.