Si tu supprimes ce message, tu risques de perdre l'adresse du propriétaire.

Because after si meaning if, French normally uses the present tense for a real or possible condition.

So the pattern here is:

• si + present
• then a result clause in the present, future, or imperative

In this sentence:

• si tu supprimes = if you delete
• not si tu supprimeras, because French does not use the future tense directly after si in this kind of sentence.

A few similar examples:

• Si tu viens, je suis content.
• Si tu viens, je serai content.
• Si tu viens, appelle-moi.

But not:

• Si tu viendras... in this kind of meaning

So si tu supprimes is the normal, correct structure.

Supprimes is the present indicative, second person singular of supprimer.

The full present-tense pattern is:

• je supprime
• tu supprimes
• il/elle/on supprime
• nous supprimons
• vous supprimez
• ils/elles suppriment

So tu supprimes simply matches tu.

Tu risques de perdre means you risk losing or you may end up losing. It expresses a possibility or danger, not a certain result.

So the nuance is:

• tu perds = you lose
• tu perdras = you will lose
• tu risques de perdre = you are at risk of losing / you might lose

That makes it a softer warning: deleting the message may cause this problem, but it is not presented as 100% guaranteed.

In French, risquer de + infinitive is a very common structure meaning to risk doing something.

Here:

• tu risques de perdre
• literally: you risk to lose
• natural English: you risk losing

This structure is important:

• risquer de faire quelque chose = to risk doing something

Examples:

• Tu risques d'oublier. = You risk forgetting.
• Il risque de pleuvoir. = It may rain.
• Nous risquons d'être en retard. = We may be late.

So the de is required before the infinitive perdre.

Here, supprimer means to delete, remove, or erase, especially in a digital or administrative context.

It is not usually the same as English suppress, even though the words look similar. So this is a classic false-friend situation.

In this sentence:

• supprimer ce message = delete this message

Depending on context, French can also use:

• effacer = erase
• enlever = remove

But supprimer is very common for deleting messages, files, items, etc.

Because message is a masculine singular noun that begins with a pronounced consonant.

The masculine singular demonstrative adjective is:

• ce before a consonant
• cet before a vowel or silent h

So:

• ce message
• ce livre
• cet email
• cet homme

Since message starts with m, you use ce.

Because adresse begins with a vowel, and French normally shortens la to l' before a vowel sound. This is called elision.

So:

• la + adresse becomes l'adresse

Other examples:

• l'école
• l'idée
• l'image

This happens very often in French, so it is something to get used to early.

Du is the contraction of de + le.

So:

• de le propriétaire becomes du propriétaire

Here it means of the owner.

The phrase breaks down like this:

• l'adresse = the address
• du propriétaire = of the owner

So l'adresse du propriétaire = the owner's address or more literally the address of the owner.

French often expresses possession with de:

• le livre du professeur = the teacher's book
• la voiture du voisin = the neighbor's car

If the noun after de were feminine singular, there would be no contraction:

• l'adresse de la propriétaire

Tu is the informal singular form of you.

French distinguishes between:

• tu = informal singular
• vous = formal singular or plural

So this sentence is addressing one person in a familiar, direct way. That is common in some apps, websites, and instructions, especially when they want a friendly tone.

A more formal version would be:

• Si vous supprimez ce message, vous risquez de perdre l'adresse du propriétaire.

Both are grammatically correct; the difference is mainly tone and audience.

Yes, it could, but the meaning would shift slightly.

Current version:

• Si tu supprimes ce message, tu risques de perdre l'adresse du propriétaire.

This sounds like a warning about a possible consequence.

A future-based version might be:

• Si tu supprimes ce message, tu perdras l'adresse du propriétaire.

That sounds more definite: deleting the message will cause the loss.

So the original sentence is a little more cautious and natural for a warning where the consequence is likely but not presented as absolute certainty.