Hvis adressen ikke stemmer, kommer pakken ikke frem.

Hvis means if and introduces a condition.

So Hvis adressen ikke stemmer, kommer pakken ikke frem is a conditional sentence:

• Hvis ... = If ...
• the rest of the sentence gives the result

A very literal structure is:

• If the address is not correct / does not match, the package does not arrive.

In Danish, hvis is the normal word for if in this kind of statement.

In Danish, the definite article (the) is often added to the end of the noun instead of being a separate word.

So:

• adresse = address
• adressen = the address

and:

• pakke = package / parcel
• pakken = the package

This is very common in Danish. English uses a separate word (the), but Danish often uses a suffix.

Here stemmer comes from at stemme, which can mean things like:

• to be correct
• to match
• to be accurate
• to agree

In this sentence, adressen ikke stemmer means something like:

• the address is not correct
• the address doesn’t match
• the address is wrong

This is a very common Danish use of stemme. For example:

• Det stemmer. = That’s correct.
• Det stemmer ikke. = That’s not correct.

Because Danish often uses stemme where English would use be correct or be right.

English might say:

• the address is not correct

But Danish can say:

• adressen stemmer ikke

So instead of using to be + adjective, Danish uses the verb stemme.

This is normal Danish usage, not a missing word.

This is a very common word-order pattern in Danish.

In a subordinate clause

After a word like hvis, Danish usually places ikke before the finite verb:

• Hvis adressen ikke stemmer ...

Pattern:

• hvis + subject + ikke + verb

In a main clause

In a normal main clause, ikke usually comes after the finite verb:

• ... kommer pakken ikke frem

Pattern:

• verb + subject + ikke

So the different position of ikke is caused by the difference between:

• subordinate clause: Hvis adressen ikke stemmer
• main clause: kommer pakken ikke frem

This is one of the most important Danish word-order rules to learn.

Because Danish uses verb-second word order in main clauses.

When the sentence begins with something other than the subject, the finite verb must come before the subject.

Here the sentence begins with the subordinate clause:

• Hvis adressen ikke stemmer

After that, the main clause starts, and Danish puts the finite verb first:

• kommer pakken ikke frem

So the order is:

1. fronted element: Hvis adressen ikke stemmer
2. finite verb: kommer
3. subject: pakken

If you wrote the main clause alone, it would normally be:

• Pakken kommer ikke frem. = The package does not arrive / does not get through.

But after a fronted clause, it becomes:

• Hvis adressen ikke stemmer, kommer pakken ikke frem.

At komme frem is a common expression meaning:

• to arrive
• to get through
• to reach its destination

In the context of mail or delivery, pakken kommer ikke frem means:

• the package doesn’t arrive
• the package doesn’t get delivered
• the package doesn’t reach the recipient

The word frem often has the sense of forward, through, or to the destination.

Not quite.

• kommer ikke just means does not come
• kommer ikke frem means does not arrive / does not get through / does not make it to the destination

So frem adds an important idea of successful arrival.

That is why kommer ikke frem is especially natural for things like:

• letters
• packages
• emails
• phone calls
• messages

For example:

• Brevet kom ikke frem. = The letter didn’t arrive.
• Min besked kom ikke frem. = My message didn’t get through.

Yes. At stemme can also mean to vote.

For example:

• Jeg stemmer i morgen. = I’m voting tomorrow.

But in Hvis adressen ikke stemmer, that meaning would make no sense. Here it clearly means is correct / matches.

This is just a case of one Danish verb having more than one meaning, like many English verbs do.

The comma separates the subordinate clause from the main clause:

• Hvis adressen ikke stemmer, = subordinate clause
• kommer pakken ikke frem. = main clause

In Danish, this comma is standard in this kind of sentence and helps show the structure clearly.

Yes. That is also correct.

It means the same thing, but the emphasis is slightly different.

Original order

• Hvis adressen ikke stemmer, kommer pakken ikke frem.
• This puts the condition first: If the address is wrong ...

Reversed order

• Pakken kommer ikke frem, hvis adressen ikke stemmer.
• This starts with the result: The package won’t arrive ...

Both are natural. The first version is especially common when you want to present the condition first.