Poštanska dostava ide na kućnu adresu.

Poštanska dostava means postal delivery, mail delivery, or delivery by post.

• poštanska = postal, related to the mail/post office
• dostava = delivery

So the phrase refers to something being delivered through the postal system.

Because poštanska is an adjective modifying dostava.

• pošta = post, mail, post office
• poštanski / poštanska / poštansko = postal

Since dostava is a feminine noun, the adjective must also be feminine singular:

• poštanska dostava

This is normal adjective-noun agreement in Serbian.

Yes, ide literally means goes, from the verb ići = to go.

But in Serbian, ići is often used in a broader sense, especially with things like:

• mail
• packages
• documents
• payments
• orders

So Poštanska dostava ide na kućnu adresu can mean something like:

• Postal delivery goes to the home address
• The mail is delivered to the home address
• It is sent to the home address by post

It sounds natural in Serbian even though English would often choose is sent or is delivered instead of goes.

Because Serbian normally uses the expression na adresu for to an address.

So:

• na adresu = to an address
• na toj adresi = at that address

Even though English uses to, Serbian idiomatically uses na with adresa.

Using u kućnu adresu would sound wrong here.

Kućnu adresu is in the accusative singular.

Why? Because na can take different cases depending on meaning:

• na + accusative = movement toward a destination
• na + locative = location

Here there is movement/direction: the delivery goes to the address. So Serbian uses na + accusative:

• na kućnu adresu

Compare:

• Ide na kućnu adresu = It goes to the home address.
• Je na kućnoj adresi = It is at the home address.

Because both the adjective and the noun must match in:

• gender
• number
• case

Base form:

• kućna adresa = home address

Here, the phrase is in the accusative singular feminine, so both words change:

• kućna → kućnu
• adresa → adresu

That agreement is completely normal in Serbian.

Not necessarily. Kućna adresa usually means home address or residential address, not strictly an address of a physical house.

So it contrasts with things like:

• poslovna adresa = business address
• adresa firme = company address

Even if someone lives in an apartment, kućna adresa can still be the right phrase.

Yes, often there is an implied possessive in Serbian if the context already makes it clear.

So na kućnu adresu may mean:

• to the home address
• to your home address
• to one’s home address

Serbian often leaves out words like my, your, his, etc. unless they are needed for clarity or emphasis.

If you want to make it explicit, you could say:

• na vašu kućnu adresu = to your home address

Yes. Serbian word order is more flexible than English word order.

The neutral version is:

• Poštanska dostava ide na kućnu adresu.

But you could also move things around for emphasis, for example:

• Na kućnu adresu ide poštanska dostava.

That puts more focus on the destination.

Even though word order can change, the original sentence sounds neutral and standard.

You could, but it is a little different in nuance.

• Pošta = mail, post
• poštanska dostava = postal delivery / delivery by mail

So:

• Pošta ide na kućnu adresu = The mail goes to the home address.
• Poštanska dostava ide na kućnu adresu = Postal delivery goes to the home address.

The original version sounds a bit more formal or administrative.

Because Serbian does not have articles like English a/an/the.

So kućnu adresu can mean:

• a home address
• the home address

The exact meaning depends on context.

That is very normal in Serbian, and learners usually have to get used to understanding definiteness from the situation rather than from an article.