uketorinin no namae wo kakuninsinai mama okuru to, nimotu ga modotte kurukoto mo arimasu.

受取人（うけとりにん） means the recipient or the person who receives something.

In this sentence, it refers specifically to the person who is supposed to receive the package.

Similar words:

• 相手 = the other person / the other party
• 宛名 = the name/address written on the package or envelope
• 受取人 = the actual intended receiver

So 受取人の名前 is specifically the recipient's name, not just any name written somewhere.

The particle の connects two nouns and often shows possession or relationship.

So:

• 受取人 = recipient
• 名前 = name
• 受取人の名前 = the recipient's name

This works a lot like 's in English.

Other examples:

• 先生の本 = the teacher's book
• 日本の文化 = Japanese culture
• 会社の住所 = the company's address

を marks the direct object of the verb.

Here, the verb is 確認しない (do not confirm/check), and the thing being checked is 受取人の名前.

So:

• 受取人の名前を確認しない = do not check the recipient's name

A literal breakdown is:

• 受取人の名前 = recipient's name
• を = object marker
• 確認しない = do not confirm

まま means something like while still in that state, without changing that state, or as is.

So:

• 確認しない = not checking
• 確認しないまま = without checking / leaving it unchecked

In this sentence:

• 受取人の名前を確認しないまま送る = to send it without checking the recipient's name

This pattern is very common:

• 朝ご飯を食べないまま出かけた = I went out without eating breakfast.
• 電気をつけたまま寝た = I fell asleep with the light left on.

So Vないまま often means without doing V.

All of these can express something like without checking, but the nuance is a little different.

• 確認しないまま = send it in the state of not having checked
• 確認せずに = send it without checking
• 確認しなくて can sometimes work, but it often sounds more like because one didn't check depending on context, so it is less precise here

So 〜ないまま is a very natural choice when you want to emphasize that the action happened while the previous thing remained undone.

In other words, the package gets sent with the check still not done.

Yes. Here, と is a conditional particle.

• 送ると = if/when you send it
• In this sentence: 確認しないまま送ると = if you send it without checking

The particle と often expresses a natural consequence, habitual result, or likely outcome.

So this sentence sounds like:

• If you send it without checking the recipient's name, the package may be returned.

A few comparisons:

• 春になると暖かくなる。 = When spring comes, it gets warm.
• このボタンを押すと、ドアが開きます。 = If you press this button, the door opens.

Here, the speaker is describing a possible result of that action.

Because it appears before the conditional particle と, the verb is normally put in its plain form.

So:

• 送ると = if/when one sends
• not 送りますと in normal everyday Japanese

Also, the whole sentence is written in a plain explanatory style:

• 確認しない
• 送る
• あります

This kind of style is very common in notices, explanations, instructions, and written guidance.

Because 荷物 is the thing that does the verb 戻ってくる.

• 荷物が戻ってくる = the package comes back / is returned

Here, 荷物 is the grammatical subject of 戻ってくる, so it takes が.

If you used を, it would mean the package is the direct object of another verb, which is not what's happening here.

戻る means to return/go back.

戻ってくる literally means to return and come back (toward here / toward the relevant place).

In the context of mail or packages, 戻ってくる is very natural because it suggests the package comes back to the sender or the handling location.

So:

• 荷物が戻る = the package returns
• 荷物が戻ってくる = the package comes back

In English, both may be translated as the package is returned, but 戻ってくる often feels a bit more concrete and directional.

こともあります softens the statement and means there are cases where..., sometimes..., or it may happen that...

So:

• 荷物が戻ってきます = the package will come back / is returned
• 荷物が戻ってくることもあります = the package may be returned / sometimes the package gets returned

The も adds the nuance of sometimes or in some cases.

This is useful because the speaker is not saying it always happens. They are saying it is one possible result.

A very literal breakdown:

• 戻ってくる = come back
• こと = the event/fact of coming back
• も = also / sometimes in this kind of context
• あります = exists / happens

Together: there are also cases where it comes back

Japanese often leaves out subjects and objects when they are clear from context.

So even though English needs something like:

• If you send it without checking...

Japanese does not need to say あなたが or explicitly mention it if the situation is already understood.

This is very normal. In a warning, instruction, or notice, the omitted subject is often understood as:

• you
• one
• the sender
• or just whoever is doing the action

That makes the sentence sound natural and not overly repetitive.

It is somewhere in the middle: plain written style with polite ending.

Parts like:

• 確認しない
• 送る
• 戻ってくる

are plain forms.

But the ending:

• あります

is polite.

This mixture is very common in practical written Japanese such as:

• instructions
• notices
• explanations
• customer service language

It sounds neutral, natural, and informative rather than casual conversation.