Pour envoyer cette enveloppe en recommandé, il suffit d’écrire clairement le nom du destinataire.

Pour + infinitive is a very common way to express purpose in French.

So:

• Pour envoyer cette enveloppe... = To send this envelope... / In order to send this envelope...

It works much like English to + verb when you explain why something is done.

You could also say afin d’envoyer, but pour envoyer is much more common and natural in everyday French.

Because enveloppe is a feminine singular noun.

French demonstrative adjectives are:

• ce for masculine singular
• cet for masculine singular before a vowel or mute h
• cette for feminine singular
• ces for plural

So:

• ce livre = this book
• cet homme = this man
• cette enveloppe = this envelope
• ces enveloppes = these envelopes

Since enveloppe is feminine, cette is required.

En recommandé is a set expression meaning by registered mail or as registered post.

In French, you commonly say:

• envoyer une lettre en recommandé
• expédier un colis en recommandé

Here, en introduces the manner or type of mailing.

This is just the idiomatic French expression. English speakers may expect something more literal, but in French you simply learn en recommandé as the normal phrase.

You may also hear:

• en recommandé avec accusé de réception = by registered mail with acknowledgment of receipt

So this is less about translating en word-for-word and more about learning the whole expression.

Il suffit de + infinitive is an impersonal construction meaning:

• it is enough to...
• you just need to...
• all you have to do is...

So:

• il suffit d’écrire clairement... = you just need to write clearly...

The il here does not refer to a real person or thing. It is an impersonal it, like in:

• Il faut partir. = It is necessary to leave.
• Il pleut. = It is raining.

So il suffit de is a very common pattern worth memorizing as a chunk.

Because French normally avoids putting de directly before a vowel sound.

So de + écrire becomes d’écrire.

This is called elision.

Other examples:

• de aimer → d’aimer
• de écouter → d’écouter
• de arriver → d’arriver

This happens very often in French, so it is something you will see all the time.

In French, adverbs often come after an infinitive.

So:

• écrire clairement = to write clearly
• parler lentement = to speak slowly
• répondre poliment = to answer politely

That is why clairement follows écrire here.

English often puts the adverb in a similar place, but not always. In French, infinitive + adverb is a very common and natural order.

Usually écrire clairement is the most natural position here.

French adverb placement can vary a bit, but in this sentence, putting clairement right after écrire clearly shows that it describes how the writing should be done.

So:

• il suffit d’écrire clairement le nom du destinataire

is the standard and natural phrasing.

If you moved it, the sentence could sound awkward or overly marked.

Because the sentence refers to the recipient’s name, a specific thing.

French often uses:

• le nom de...
• l’adresse de...
• le numéro de...

So:

• le nom du destinataire = the name of the recipient

Using un nom would sound strange here, because a recipient normally has one specific name relevant to the envelope.

Because de + le contracts to du in French.

So:

• de le destinataire → du destinataire

This kind of contraction is mandatory in standard French.

Other common contractions:

• à + le → au
• à + les → aux
• de + les → des

Examples:

• le nom du destinataire
• aller au bureau
• parler des enfants

Destinataire means recipient — the person who is supposed to receive the letter, package, or message.

It is the standard formal word in postal or administrative contexts.

Useful contrast:

• expéditeur = sender
• destinataire = recipient

So on a letter or package:

• nom de l’expéditeur = sender’s name
• nom du destinataire = recipient’s name

A native English speaker might wonder if a more everyday word should be used, but destinataire is exactly the right term here.

The comma separates the introductory purpose phrase from the main clause.

Structure:

• Pour envoyer cette enveloppe en recommandé, = introductory phrase
• il suffit d’écrire clairement le nom du destinataire. = main clause

This is similar to English, where you often put a comma after a long introductory phrase:

• To send this envelope by registered mail, you just need to...

The comma helps readability.

Not exactly in the usual way.

In the expression en recommandé, French uses a fixed postal phrase meaning by registered mail. It does not behave quite like a simple adjective directly attached to enveloppe.

Compare:

• une lettre recommandée = a registered letter
  Here recommandée is clearly an adjective agreeing with lettre.

But in:

• envoyer une enveloppe en recommandé

the phrase en recommandé functions more like an adverbial expression describing how it is sent.

That is why the structure may feel different from English.

French often prefers impersonal structures like il suffit de instead of directly saying you.

A more direct version could be something like:

• Vous devez écrire clairement le nom du destinataire.
• Il vous suffit d’écrire clairement le nom du destinataire.

But the original:

• Il suffit d’écrire clairement le nom du destinataire.

sounds neutral, general, and instructional — which fits this kind of sentence very well.

Yes — it contains several very useful patterns:

• Pour + infinitive = to / in order to
• envoyer ... en recommandé = send ... by registered mail
• il suffit de + infinitive = you just need to / it is enough to
• écrire clairement = write clearly
• le nom du destinataire = the recipient’s name

So even if you do not memorize the whole sentence, these chunks are very practical and reusable in real French.