Bitte schick die E-Mail noch nicht ab, ich habe eine Rückfrage.

Because the full verb is abschicken, which is a separable verb.

In a main clause or an imperative, the prefix ab- splits off and moves to the end:

• abschicken → Schick die E-Mail ab.

So in your sentence:

• Bitte schick die E-Mail noch nicht ab.

the verb is still abschicken, just split into two parts:

• schick = the main verb part
• ab = the separable prefix

This is very common in German:

• anrufen → Ich rufe dich an.
• aufmachen → Mach bitte das Fenster auf.

This is the informal singular imperative of abschicken.

For du commands, German often drops the ending -e:

• schicke! → possible, but less common in everyday speech
• schick! → very common

So both are grammatically possible:

• Bitte schick die E-Mail noch nicht ab.
• Bitte schicke die E-Mail noch nicht ab.

The shorter form schick sounds natural and standard in everyday German.

In German, the du is usually left out in the imperative.

So instead of saying:

• Du schickst die E-Mail ab. = statement

you say:

• Schick die E-Mail ab! = command

Adding du is unusual unless you want strong emphasis or contrast.

So Bitte schick ... is the normal way to say it.

Noch nicht means not yet.

It is a very common combination in German:

• noch = still / yet
• nicht = not

Together:

• noch nicht = not yet

So:

• Bitte schick die E-Mail noch nicht ab
  means: please do not send the email yet.

A useful contrast is:

• noch nicht = not yet
• nicht mehr = no longer / not anymore

Example:

• Ich bin noch nicht fertig. = I’m not finished yet.
• Ich bin nicht mehr fertig. would not make sense in the same way.

Die E-Mail is the direct object of abschicken, so it is in the accusative case.

The noun E-Mail is feminine in German:

• nominative: die E-Mail
• accusative: die E-Mail

Because feminine singular looks the same in nominative and accusative, the article stays die.

So:

• die E-Mail = the email

If the object were masculine, you would see a clearer case change:

• der Bericht → den Bericht

Because with separable verbs, the prefix goes to the end, and everything else stays in the middle.

Structure:

• Schick
  • object / adverbs + ab

So:

• Schick die E-Mail ab.
• Schick die E-Mail heute ab.
• Schick die E-Mail noch nicht ab.

This is normal German word order with separable verbs.

Yes, bitte here means please and makes the command more polite.

Compare:

• Schick die E-Mail noch nicht ab. = direct command
• Bitte schick die E-Mail noch nicht ab. = softer, more polite

German often uses bitte with imperatives, especially in everyday requests.

Rückfrage usually means a follow-up question, clarifying question, or query.

It is common in work, business, and customer-service contexts.

So:

• Ich habe eine Rückfrage.

does not necessarily mean a big question. It often means:

• I need clarification on one point
• I have one follow-up question before we continue

It is a very natural phrase in professional German.

Because haben usually takes a noun with an article in this kind of sentence.

So German says:

• Ich habe eine Rückfrage.

just like:

• Ich habe eine Frage.
• Ich habe eine Idee.

In English, we might sometimes say I have a question or just one question, but in German the article is normally included here.

Because this sentence contains two main clauses:

1. Bitte schick die E-Mail noch nicht ab
2. ich habe eine Rückfrage

In German, two independent clauses can be separated by a comma.

So the comma marks a pause and separates the two complete thoughts:

• first: the request
• second: the reason for the request

You could also use a semicolon, but the comma is very normal here.

Because ich habe eine Rückfrage is a normal main clause, and in a German main clause the conjugated verb is in second position.

So:

• Ich = position 1
• habe = position 2

You would get habe ich in a question or after something has taken first position:

• Habe ich eine Rückfrage? = Do I have a question?
• Deshalb habe ich eine Rückfrage. = That’s why I have a follow-up question.

But here it is just a regular statement:

• ich habe eine Rückfrage

The formal version would be:

• Bitte schicken Sie die E-Mail noch nicht ab, ich habe eine Rückfrage.

Here:

• schick becomes schicken Sie

This is the standard polite imperative for Sie.

You could compare:

• informal singular: Bitte schick die E-Mail noch nicht ab.
• informal plural: Bitte schickt die E-Mail noch nicht ab.
• formal: Bitte schicken Sie die E-Mail noch nicht ab.

Yes, you often can.

For example:

• Bitte sende die E-Mail noch nicht.
• Bitte senden Sie die E-Mail noch nicht.

But abschicken is very common for emails, messages, forms, and anything you submit or send off.

A rough difference is:

• senden = to send
• abschicken = to send off / submit

For emails, abschicken sounds very natural because it focuses on the act of actually hitting send.