La denegación está en el correo.

Spanish uses estar for location, so está en el correo means it is in the mail/email or it is in the post/email.

• ser = identity, definition, what something is
• estar = location, state, condition

So here, the sentence is talking about where the denial is, not what it is.

• La denegación es una respuesta oficial. = The denial is an official response.
• La denegación está en el correo. = The denial is in the mail/email.

Denegación is a fairly formal noun meaning denial or refusal, especially in official, legal, or administrative contexts.

It is more formal than some other related words:

• denegación = denial/refusal of a request, application, permission, etc.
• rechazo = rejection
• negativa = refusal / negative response

A learner might see denegación in contexts like:

• a visa denial
• an application denial
• a benefit denial
• an insurance denial

So yes, it is a real and useful word, but it sounds more official than everyday speech.

In Spanish, nouns have grammatical gender. Denegación is feminine, so it takes la.

A very common pattern is that nouns ending in -ción are feminine:

• la denegación
• la información
• la solicitud
• la decisión

This does not mean the word is feminine in a real-world sense; it is just a grammatical category.

In Spanish, nouns often need an article where English might not use one. So en el correo is the natural structure.

Here, el is part of the normal phrase:

• en el correo
• en la carta
• en el mensaje
• en el email

Saying en correo by itself would usually sound incomplete or unnatural.

Because Spanish only has two standard contractions:

• a + el = al
• de + el = del

But:

• en + el = en el
• con + el = con el

So en el correo stays exactly that.

It can mean either, depending on context.

In Spanish (including Spain Spanish), correo can refer to:

• mail/post
• email

So La denegación está en el correo could mean:

• the denial is in the postal mail
• the denial is in the email

If you want to make it clearer, Spanish often says:

• correo electrónico = email
• correo postal = postal mail

In real life, many speakers would clarify if there is any chance of confusion.

Yes, it is grammatical, but whether it sounds fully natural depends on context.

A native speaker might sometimes prefer something more specific, such as:

• La denegación está en el correo electrónico.
• La denegación viene en el correo.
• La denegación está en la carta.

Why? Because correo on its own can be a little broad or ambiguous. Still, the original sentence is understandable and correct.

Correo is masculine, so it takes el: el correo.

Many nouns ending in -o are masculine, and many ending in -a are feminine, so this matches a very common pattern:

• el correo
• el libro
• el documento

But it is not an absolute rule. There are exceptions in Spanish, so learners should treat endings as useful clues, not guarantees.

The written accents show the stressed syllable:

• denegación → stress on the final -ción
• está → stress on the second syllable, -tá

So roughly:

• de-ne-ga-CIÓN
• es-TÁ

Those written accents are important because they tell you both pronunciation and correct spelling.

Yes. Spanish allows more flexibility in word order than English, although the original order is the most neutral:

• La denegación está en el correo. = neutral, standard

You could also say:

• En el correo está la denegación.

This sounds more marked or emphatic, as if you are focusing on where it is.

So the original sentence is the most straightforward version, but other orders are possible depending on emphasis.

Usually not in this context.

• negación usually means negation or denial in a broader or more abstract sense
• denegación is specifically the refusal or denial of a request, permission, claim, application, etc.

So if you are talking about an official denial, denegación is the better choice.

For example:

• la denegación de la solicitud = the denial of the application

Using negación here would often sound less precise or simply wrong for an administrative context.