A kölcsönző e-mailt küld a bérleti díjról és a kaucióról.

In this sentence, kölcsönző most naturally means the rental company / rental office / rental agency.

It comes from the verb kölcsönöz, which can mean to lend or to rent out, so kölcsönző can refer to:

• a place that rents things out
• a business that does that
• sometimes the lender/renter-out in a broader sense

Because the sentence also mentions rental fee and deposit, the business meaning is the best fit here.

The -t is the accusative ending, which marks the direct object in Hungarian.

So:

• e-mail = email
• e-mailt = email + direct object ending

In this sentence, the email is the thing being sent, so it takes -t.

This is very common:

• levelet ír = writes a letter
• üzenetet küld = sends a message
• e-mailt küld = sends an email

Because Hungarian has indefinite and definite verb conjugation.

Here the object is e-mailt, which is indefinite / non-specific, so the verb uses the indefinite form:

• küld = sends

If the object were definite, you would normally use the definite form:

• Az e-mailt küldi. = He/she is sending the email.

So the contrast is roughly:

• e-mailt küld = sends an email / sends email
• az e-mailt küldi = sends the email

Hungarian often leaves out egy where English would use a/an.

So:

• e-mailt küld can mean sends an email or more generally sends email
• egy e-mailt küld is also possible, but it puts a little more emphasis on one email

With a bare indefinite object like this, Hungarian very often prefers the version without egy, especially in neutral, matter-of-fact statements.

The ending -ról / -ről is a Hungarian case ending that often means about / regarding in sentences like this.

So:

• a bérleti díjról = about the rental fee
• a kaucióról = about the deposit

Its basic physical meaning is more like off/from, but Hungarian uses it in several abstract ways too. After expressions like e-mailt küld valamiről, it corresponds well to English about.

Because in Hungarian, when two nouns are joined by és and both have the same grammatical role, each one normally gets its own case ending.

So Hungarian says:

• a bérleti díjról és a kaucióról

rather than putting the ending only once at the beginning.

This is the natural Hungarian pattern. The article is also usually repeated:

• a ... és a ...

A is the Hungarian definite article, meaning the.

Here it is used because the sentence is talking about specific things in a rental situation:

• the rental fee
• the deposit

Hungarian often uses the definite article in places where English might or might not use the, so this can feel a little different from English habits. In this sentence, though, the definite article sounds very natural.

Díj means fee or charge.

Bérleti is an adjective meaning something like rental-related / lease-related. The -i ending is a common way in Hungarian to form this kind of relational adjective.

So:

• bérleti díj = rental fee

You can think of it as a fixed expression meaning the fee connected with the rental.

Hungarian word order is much more flexible than English word order, and it depends a lot on topic and focus.

In this sentence:

• A kölcsönző is the topic: we are talking about the rental company
• e-mailt küld forms a very natural verbal unit: sends email / sends an email

Also, a bare indefinite object like e-mailt often appears directly before the verb in Hungarian.

So this word order is very natural. Other orders are possible, but they can shift the emphasis.

Küld is present tense, third person singular.

So grammatically it means:

• he/she/it sends

In context, Hungarian present tense can describe:

• a regular action
• a current action
• sometimes a scheduled or near-future action

So depending on the situation, this could mean something like:

• the rental company sends an email
• the rental company will send an email

But the verb form itself is simply present tense.

This is a vowel harmony detail that often surprises learners.

Even though díj contains a front/neutral vowel, the correct suffixed form is:

• díjról

not díjről.

Some Hungarian words with only so-called neutral vowels still take back-vowel suffixes. Díj is one of those words, so this is something you mostly just learn with the word itself.

Similar vowel-harmony patterns are not always fully predictable for learners, so memorizing the correct suffixed form is normal.