Nous envoyons la réclamation par courriel.

Yes. Envoyons is the present indicative form of envoyer for nous (we).

In French, the present tense often covers both:

• we send
• we are sending

So Nous envoyons la réclamation par courriel can mean either, depending on context.

Nous means we, and envoyons is the matching nous form of the verb envoyer (to send) in the present tense.

The present-tense forms are:

• j’envoie
• tu envoies
• il/elle/on envoie
• nous envoyons
• vous envoyez
• ils/elles envoient

A common thing learners notice is that envoyer changes spelling in some forms:

• j’envoie
• but nous envoyons

That is normal for this verb.

Because the verb is envoyer, and in the nous form it keeps the y:

• nous envoyons

Many verbs ending in -yer behave like this. In some forms, the y can change to i:

• j’envoie
• tu envoies
• il envoie

But with nous and vous, French keeps the y:

• nous envoyons
• vous envoyez

So envoions is not correct.

In French, nouns usually need an article. So instead of just saying we send complaint, French normally says we send the complaint or a complaint.

Here:

• la réclamation = the complaint

This suggests a specific complaint, or at least one that is understood from the context.

If it were not specific, you might see:

• Nous envoyons une réclamation par courriel.
• We are sending a complaint by email.

French nouns have grammatical gender, and réclamation is a feminine noun. That is why it takes:

• la réclamation

A useful pattern: nouns ending in -tion are very often feminine:

• la situation
• la question
• la réclamation

This is grammatical gender, so it does not mean the thing itself is literally feminine.

Par courriel means by email or via email.

Here, par expresses the means or method used to do something:

• par téléphone = by phone
• par écrit = in writing
• par courriel = by email

So in this sentence, par courriel tells you how the complaint is being sent.

Yes, depending on the variety of French.

• courriel is especially common in Canadian French and in more formal or recommended usage.
• e-mail and especially mail are very common in France in everyday speech.

So all of these may be understood:

• par courriel
• par e-mail
• par mail

If you want a safe, standard option, courriel is a good choice, especially in formal contexts.

In normal French, nous is usually necessary.

French subject pronouns are generally not dropped, because the spoken verb forms are often not distinct enough by themselves. So:

• Nous envoyons la réclamation par courriel is the normal full sentence.

Leaving out nous would sound incomplete in standard French.

Because it is a phrase telling you how the action is done, and in French that kind of information often comes after the verb and its object.

So the order is:

• Nous = subject
• envoyons = verb
• la réclamation = direct object
• par courriel = method/means

This is a very natural word order in French.

A rough pronunciation is:

ray-kla-ma-syon

More precisely in IPA, it is: /ʁe.kla.ma.sjɔ̃/

A few useful points:

• ré- sounds like ray
• tion in French often sounds like syon
• the final n in -on is not pronounced as a full n sound; it nasalizes the vowel

So réclamation does not sound like the English word reclamation.

Yes, in everyday spoken French, many speakers use on instead of nous for we.

So you could hear:

• On envoie la réclamation par courriel.

This is very common in conversation.

However:

• nous is more formal or neutral in writing
• on is more common in casual speech

So the original sentence with nous is perfectly correct, especially in formal or written French.