okurisaki no yuubinbangou o hitotsu machigaete, sukoshi awatemashita.

I got one digit wrong in the destination’s postal code and panicked a little.

Breakdown of okurisaki no yuubinbangou o hitotsu machigaete, sukoshi awatemashita.

• を: direct object particle
• の: possessive case particle
• 少すこし: a little
• 〜て: connective form

Questions & Answers about okurisaki no yuubinbangou o hitotsu machigaete, sukoshi awatemashita.

What does 送り先 mean here, and why not just 住所?

送り先 means destination / recipient address / where something is being sent.

It is often used when talking about mailing, shipping, or delivery.
By contrast, 住所 means address in a more general sense.

So:

• 送り先 = the place/person you are sending something to
• 住所 = an address in general

In this sentence, 送り先 fits well because the topic is a postal code for something being sent.

What is the role of の in 送り先の郵便番号?

Here, の links two nouns and shows that the second noun belongs to or is associated with the first.

So:

• 送り先 = destination / recipient
• 郵便番号 = postal code
• 送り先の郵便番号 = the destination’s postal code / the postal code of the place it was being sent to

This is a very common noun-connecting pattern in Japanese.

Why is を used after 郵便番号?

を marks the direct object of the verb.

The verb here is 間違える, which means to make a mistake with, to get wrong, or to confuse something.

So in:

• 郵便番号を間違えて

the postal code is the thing that was gotten wrong.

You can think of it as:

• I got the postal code wrong