balsongineun baesong johoereul hwaginhamyeo gogaek senteo-e munuihaessseupnida.

발송인 means sender or shipper.

The -은 is the topic particle. It marks 발송인 as the topic of the sentence:

• 발송인은 = as for the sender, the sender

In this sentence, -은 helps frame the sender as the person we are talking about. If you used -이/가 instead, the nuance would shift more toward simply identifying the subject.

So:

• 발송인은 → the sentence is about the sender
• 발송인이 → the sender is being presented more directly as the subject

Both can be grammatical in different contexts, but -은 is very natural here.

This is a very common point of confusion.

• 발송 = sending / dispatch
• 배송 = delivery / shipping process

So in this sentence:

• 발송인 = the sender, the person who sent the item
• 배송 조회 = delivery tracking, shipment tracking

A helpful way to think about it:

• 발송 focuses on the act of sending something out
• 배송 focuses on the movement and delivery of the item to its destination

Even though they are related, they are not interchangeable.

배송 조회 means delivery tracking or tracking information.

Breaking it down:

• 배송 = delivery, shipping
• 조회 = inquiry, lookup, checking up on information

So 배송 조회를 확인하며 means something like:

• checking the delivery tracking
• checking the tracking information
• reviewing the shipment status

The -를 is the object particle, marking 배송 조회 as the thing being checked.

확인하며 comes from 확인하다, which means to check or to confirm.

The ending -며 connects two actions and usually means:

• while doing
• and
• as

So:

• 배송 조회를 확인하며 고객 센터에 문의했습니다 = The sender checked the tracking information while contacting the customer center or = The sender checked the tracking information and contacted the customer center

In many cases, -며 suggests that the two actions are related and happen at roughly the same time, or that one action accompanies the other.

It is slightly more formal or written-sounding than some other connectors.

These forms are similar, but the nuance is a little different.

• 확인하며 → somewhat formal, written style; while checking / and checking
• 확인하면서 → very clearly while checking
• 확인하고 → simply checked and then... or check and...

So:

• 확인하며 문의했습니다
  sounds smooth and written, with the sense that the actions are connected

• 확인하면서 문의했습니다
  strongly emphasizes simultaneity: contacted them while checking

• 확인하고 문의했습니다
  can sound more sequential: checked it and then contacted them

In your sentence, 확인하며 gives a neat, formal written tone.

Because 문의하다 often takes the place or organization being contacted with 에.

So:

• 고객 센터에 문의했습니다 = contacted the customer center / made an inquiry to the customer center

Here, 에 marks the target or destination of the inquiry.

This is a common pattern:

• 회사에 문의하다 = inquire with the company
• 학교에 문의하다 = contact the school for information
• 고객 센터에 문의하다 = contact customer service

In English, we often say contact without a preposition, but Korean commonly uses 에 with 문의하다.

문의하다 means to inquire, to make an inquiry, or to contact someone for information/help.

It is more formal than simply 묻다, which means to ask.

So:

• 묻다 = ask
• 문의하다 = inquire, contact formally for assistance or information

That is why 고객 센터에 문의했습니다 sounds natural in a customer service or shipping context. It implies the sender contacted customer support in a formal, practical way.

문의했습니다 is:

• 문의하다
  • past tense -았/었-
    • formal polite ending -습니다

So it means:

• inquired
• contacted
• made an inquiry

with a formal, polite tone.

This style is common in:

• written reports
• customer service language
• news
• formal explanations
• official communication

If you made it less formal, you could say:

• 문의했어요 = polite but less formal
• 문의했어 = casual

It is common in logistics, forms, shipping, and official contexts, but less common in casual everyday speech.

You are more likely to see 발송인 in:

• shipping labels
• delivery forms
• tracking systems
• business documents

In casual speech, people might say something more like:

• 보낸 사람 = the person who sent it
• 택배 보낸 사람 = the person who sent the package

So 발송인 is correct and natural here because the sentence sounds formal and logistics-related.

Yes, both can appear.

• 고객센터
• 고객 센터

In real Korean, compound nouns are sometimes written with or without a space depending on style, house rules, or context. 고객센터 is very common as a fixed noun meaning customer center / customer service center.

Writing it as 고객 센터 is still understandable, but 고객센터 is often more standard-looking as a single service term.

So the sentence would also very naturally appear as:

• 발송인은 배송 조회를 확인하며 고객센터에 문의했습니다.

It usually suggests that the actions are linked and overlapping, or that one was done in the course of the other.

So the sentence most naturally gives the idea:

• the sender contacted customer service while checking the tracking information
• the sender checked the tracking information and, in that process, contacted customer service

It does not strongly emphasize a strict sequence such as:

1. checked tracking
2. then later contacted customer service

If you wanted that clearer sequence, 확인하고 would be more direct.

So -며 here gives a softer sense of connected or concurrent actions.

Yes. A few natural translations are possible depending on how you want to show -며:

• The sender checked the tracking information while contacting customer service.
• The sender contacted the customer center while checking the delivery status.
• The sender reviewed the tracking information and contacted customer service.

All of these capture the basic meaning. The main thing is that the sender did both actions, and they are presented as closely connected.