Přístupový kód je v e-mailu.

Czech normally does not use articles. So Přístupový kód can mean the access code or an access code, depending on context.

If Czech speakers want to be more explicit, they can use other words, for example ten přístupový kód for something like that/the access code, but in a normal sentence like this, no article is needed.

Přístupový is an adjective. It is built from přístup, which means access or entry.

So přístupový kód is literally something like access-related code, which is the normal Czech way to say access code.

This is very common in Czech: where English often uses noun + noun compounds, Czech often prefers adjective + noun.

Because it has to agree with kód.

In this sentence:

• kód is masculine inanimate
• singular
• nominative case

So the adjective also takes the matching form přístupový.

If the noun changed, the adjective would change too. For example:

• přístupový kód — masculine singular
• přístupová stránka — feminine singular
• přístupové kódy — plural

Je is the 3rd person singular present tense of být = to be.

So here it simply means is.

• já jsem — I am
• ty jsi — you are
• on/ona/ono je — he/she/it is

In this sentence, kód is singular, so je is the correct form.

Because the preposition v meaning in requires the locative case when it expresses location.

So:

• dictionary form: e-mail
• after v: v e-mailu

That is why the ending changes.

This is a very common pattern in Czech:

• v domě — in the house
• v telefonu — in the phone
• v e-mailu — in the email

The basic form of the preposition is v.

The longer form ve is only used when pronunciation is easier that way, especially before certain consonant clusters or words beginning with v or f. For example:

• ve škole
• ve středu
• ve Francii

Before e-mailu, plain v is the normal choice, because it is easy to pronounce.

No, Czech word order is fairly flexible.

Přístupový kód je v e-mailu. is a neutral, natural sentence.

But you could also say:

V e-mailu je přístupový kód.

That is also correct, but it shifts the emphasis more toward where the code is.

So in Czech, changing word order often changes focus or information structure, not just grammar.

A few useful points:

• Czech stress is usually on the first syllable of each word.
• ř in Přístupový is a special Czech sound with no exact English equivalent.
• ú/ó/ý are long vowels.
• je sounds like ye in yes.
• e-mailu is commonly pronounced close to ímejlu in everyday Czech pronunciation.

The hardest part for most English speakers is ř. You do not need to master it immediately to be understood.

You will commonly see both e-mail and email.

The version with a hyphen, as in e-mailu, is very common and standard. In many contexts, email also appears.

Both forms are understood, and both can be declined:

• e-mail / email
• e-mailu / emailu

If you want the safest general written form, e-mail is a good choice.

Yes, you might hear mail in informal speech, especially in casual conversation.

But e-mail is more neutral and standard in general-purpose Czech, especially for learners.

So:

• v e-mailu — neutral, standard
• v mailu — more informal/casual

For learning and careful writing, v e-mailu is the better model.