Πήγα να στείλω το email χωρίς το συνημμένο, αλλά το είδα πριν πατήσω αποστολή.

In Greek, πήγα να + verb is a very common pattern. Literally, it starts from the idea of I went to do something, but in real usage it often means:

• I was about to do something
• I nearly did something
• I set out to do something

So Πήγα να στείλω το email does not necessarily mean you physically went somewhere. It usually means:

• I was about to send the email
• I nearly sent the email

This is an idiomatic structure, and learners hear it very often in everyday Greek.

After να, Greek normally uses the subjunctive form, not the plain dictionary form.

So:

• στέλνω = I send / I am sending
• να στείλω = that I send / to send / for me to send

In this sentence, στείλω is the perfective subjunctive form of στέλνω. It focuses on the action as a whole, as a single completed event: send the email.

That makes sense here, because sending an email is seen as one complete action.

This is a very common Greek verb pair:

• στέλνω = imperfective stem
• στείλω = perfective stem

Very roughly:

• στέλνω focuses more on the process, repetition, or ongoing nature
• στείλω focuses on a single complete action

Examples:

• Θέλω να στέλνω emails κάθε μέρα. = I want to send emails every day.
  (habit / repeated action)

• Θέλω να στείλω ένα email τώρα. = I want to send one email now.
  (one complete action)

In your sentence, the speaker means one specific act of sending, so να στείλω is the natural choice.

Greek often borrows foreign words and gives them a grammatical gender. email is usually treated as neuter, so it takes:

• το email = the email

That is why later the speaker says:

• το είδα = I saw it

Here, το refers back to το email.

You may also hear το μέιλ in everyday speech, which is another common borrowed form.

συνημμένο means attachment in the context of email.

It comes from the participle of a verb meaning attached, so literally it is something like the attached thing. In email language, Greek uses it as a noun:

• το συνημμένο = the attachment

It is neuter, so it takes:

• το συνημμένο

And after χωρίς you also keep the accusative form:

• χωρίς το συνημμένο = without the attachment

Because χωρίς is followed by the accusative in Modern Greek.

So you get:

• χωρίς το συνημμένο
• χωρίς το βιβλίο
• χωρίς εσένα

This is just something to memorize: χωρίς + accusative.

Grammatically, το most naturally refers to το email, because that is the nearest neuter singular noun already mentioned.

So:

• το email → το είδα = I saw it

The idea is usually:
I was about to send the email without the attachment, but I noticed it before I hit send.

In natural English, we might understand this as I noticed that the attachment was missing, but the Greek sentence literally says I saw it, referring most directly to the email or the issue in the email before sending.

Context can make the exact nuance clearer, but grammatically το points back to το email.

After πριν, Modern Greek commonly uses the subjunctive form without να.

So:

• πριν πατήσω αποστολή = before I press send

This is very normal Greek.

You may sometimes encounter πριν να in some contexts, but in standard everyday usage, πριν + subjunctive form without να is extremely common and natural.

Yes. πατήσω is the perfective subjunctive form of πατάω / πατώ.

Here:

• πριν πατήσω αποστολή = before I press send

Just like στείλω, this is a single complete action, so Greek uses the perfective form.

You can think of it as:

• πατάω = I press / I am pressing
• να πατήσω or after πριν, simply πατήσω = to press / that I press, as one complete action

In technology-related Greek, Αποστολή often functions like the name of a button or command: Send.

So:

• πατάω αποστολή
• πατάω το κουμπί της αποστολής
• πατάω send

are all understandable, but πατάω αποστολή is a very natural compressed way to say press Send.

Greek often drops the article in this kind of interface/button language, especially when referring to what is written on a button.

Πήγα is the aorist form of πηγαίνω, and here it fits the fixed expression πήγα να + verb.

This structure is idiomatic and usually appears with the aorist:

• πήγα να πέσω = I almost fell
• πήγα να γελάσω = I almost laughed
• πήγα να στείλω = I almost sent / I was about to send

Using πήγαινα would suggest an ongoing or repeated action and would not sound right here for this meaning.

Using έχω πάει would also not fit the idiom.

So this is one of those cases where the tense choice is strongly tied to the expression itself.

Not very naturally. A word-for-word rendering would sound odd:

• I went to send the email without the attachment, but I saw it before I pressed send.

Greek is using normal Greek idioms, but English would usually rephrase them. More natural English versions might be:

• I was about to send the email without the attachment, but I noticed it before I hit send.
• I almost sent the email without the attachment, but I saw it before pressing send.

So this is a good example of why Greek should not always be translated literally, even when the individual words are familiar.

It sounds like normal, natural modern Greek, especially in everyday writing or speech.

A few things make it feel modern and natural:

• email as a borrowed word
• συνημμένο as standard email vocabulary
• πατήσω αποστολή as interface/technology language
• πήγα να στείλω as a common spoken-style structure

So this is exactly the kind of sentence a learner might realistically hear or say in daily life.