Zračni prijevoznik poslao je e-mail.

Literally, zračni prijevoznik means air carrier or air transport operator.

• zračni = air / aerial
• prijevoznik = carrier / transporter / transport operator

In context, it can often be translated naturally as airline. It usually refers to the company or carrier, not to an individual person like a pilot.

Poslao je is the past tense usually called the perfect in Croatian.

It is made from:

• poslao = the past participle
• je = is, the 3rd person singular form of biti (to be) used here as an auxiliary

So literally the structure is something like has sent, but in normal English this sentence is usually translated as sent.

Because poslao agrees with the subject, zračni prijevoznik, which is masculine singular.

In the Croatian past tense, the participle changes according to the gender and number of the subject:

• masculine singular: poslao
• feminine singular: poslala
• neuter singular: poslalo

So because prijevoznik is a masculine singular noun, the correct form is poslao.

It is in the nominative, because it is the subject of the sentence.

Both words match each other:

• zračni = masculine singular nominative
• prijevoznik = masculine singular nominative

That agreement is normal in Croatian: adjectives match the noun in gender, number, and case.

Because Croatian does not have articles.

So zračni prijevoznik can mean:

• the air carrier
• an air carrier
• sometimes just air carrier

The exact meaning depends on context. English forces you to choose the or an, but Croatian usually leaves that unstated.

Yes, e-mail is the direct object, so it is in the accusative.

But e-mail is treated as a masculine inanimate noun, and for many masculine inanimate nouns, the accusative singular is the same as the nominative singular.

So:

• nominative: e-mail
• accusative: e-mail

That is why the form does not visibly change here.

In other cases, it does change, for example:

• bez e-maila = without the email
• u e-mailu = in the email

Yes. That is also correct.

Croatian word order is more flexible than English. Both of these are possible:

• Zračni prijevoznik je poslao e-mail.
• Zračni prijevoznik poslao je e-mail.

The meaning is basically the same. The difference is mainly one of style, rhythm, or emphasis. Learners will often first meet je poslao, but poslao je is also normal.

The dictionary form is poslati, which means to send.

So:

• poslati = infinitive
• poslao je = he/it sent

This is the verb you would look up in a dictionary.

Because Croatian distinguishes aspect.

• poslati is perfective: it describes a completed sending
• slati is imperfective: it describes sending in progress, repeated sending, or habitual sending

In this sentence, the action is understood as one completed event, so poslati / poslao je is the natural choice.

Compare:

• Zračni prijevoznik poslao je e-mail. = The airline sent an email.
• Zračni prijevoznik slao je e-mailove. = The airline was sending emails / used to send emails.

In Croatian, zračni is an adjective meaning air / aerial, and it modifies prijevoznik.

So the structure is:

• zračni = adjective
• prijevoznik = noun

Croatian often uses an adjective where English may use a noun modifier. So English air carrier becomes Croatian zračni prijevoznik.

The adjective must agree with the noun:

• masculine
• singular
• nominative

Yes, e-mail is very common and completely understandable in Croatian.

You may also see other spellings or forms, depending on style:

• e-mail
• email
• sometimes more adapted spellings like imejl

But e-mail is a very normal choice, especially in modern written Croatian.