بعد ما اشتريت طابع من مكتب البريد، بعتت الرسالة.

Here بعد ما means after when it introduces a whole clause.

So:

• بعد = after
• ما helps connect it to the verb phrase that follows

In this sentence, بعد ما اشتريت... means after I bought.... This is a very common Levantine way to say this in everyday speech.

No. In this sentence, ما is not negative.

A learner often sees ما and thinks of negation, because ما can mean not in other contexts. But in بعد ما, it is part of a time expression meaning after + a clause.

So بعد ما اشتريت does not mean after I didn’t buy. It simply means after I bought.

In Levantine, اشتريت is a past-tense form of اشترى / يشتري = to buy.

The ending -ت is what tells you the subject is I or sometimes you (masculine singular), depending on context. So اشتريت can mean:

• I bought
• you bought (addressing one man)

Context tells you which one is meant. In your sentence, it is understood as I bought.

Because Arabic verbs usually already include the subject.

So اشتريت already means I bought, and بعتت already means I sent. You do not need to add أنا unless you want emphasis or contrast.

For example:

• اشتريت طابع = I bought a stamp
• أنا اشتريت طابع = I bought a stamp

The second version is more emphatic.

Because طابع is indefinite here: a stamp.

Arabic does not have a separate word for a/an. Instead:

• طابع = a stamp
• الطابع = the stamp

But الرسالة is definite, meaning the letter:

• رسالة = a letter
• الرسالة = the letter

So the sentence is making a normal definite/indefinite contrast: a stamp but the letter.

It literally means something like the office of the mail.

This is an idafa structure, which is very common in Arabic:

• مكتب = office
• البريد = the mail / post

Together, مكتب البريد means post office.

This is a standard and very common expression.

Because من here means from.

The phrase طابع من مكتب البريد means a stamp from the post office. It shows the source or place where the stamp was obtained.

So:

• اشتريت طابع من مكتب البريد = I bought a stamp from the post office

In natural English, we might also say at the post office, but Arabic often uses من in this kind of context.

بعتت is the Levantine past form meaning I sent.

A helpful way to think of it is:

• base verb: بعت = he sent
• add -ت for I in the past
• this gives بعتت

Since the verb stem already ends in ت, and the I ending is also ت, you get two t sounds next to each other in writing.

In everyday Arabic writing, short vowels are usually not written, so the exact pronunciation can vary a bit by region and speaker, but the meaning here is clearly I sent.

It is specifically colloquial Levantine.

In Modern Standard Arabic, you would more likely see something like:

• أرسلتُ الرسالة
• or بعثتُ الرسالة

In Levantine speech, بعت as send is very common, and forms like بعتت sound natural in conversation.

So this sentence is clearly in spoken dialect, not formal written Arabic.

A rough pronunciation would be:

baʿd ma ishtareit ṭābeʿ mn maktab il-barīd, baʿatet ir-risāle

A few useful notes:

• من is often reduced in speech to mn
• الرسالة is often pronounced ir-risāle or er-risāle, because the ل of ال assimilates before ر
• اشتريت may sound slightly different depending on region, like ishtareit or ishtarēt

So do not worry if you hear small pronunciation differences across Levantine varieties.

Because the sentence describes two completed actions in sequence:

1. buying the stamp
2. sending the letter

Using the past tense for both verbs is the normal way to express this in Levantine. The phrase بعد ما already tells you the order, so you do not need a separate form like English sometimes uses with after doing....

So the structure is simply:

• بعد ما
  • past verb
• past verb

Yes, you often can, depending on the nuance.

For example:

• لما اشتريت طابع من مكتب البريد، بعتت الرسالة

This can mean something like when I bought a stamp from the post office, I sent the letter or once I bought... depending on context.

But بعد ما is more explicitly after, so it is the clearest match for the sequence in your sentence. In other words:

• بعد ما = more clearly after
• لما = when / once, sometimes functioning similarly

So بعد ما is a very natural choice here.