Why is it die Mailbox?

Mailbox is a compound noun, and German compounds take the article of their last word: die Box. So it’s die Mailbox.

Sense 1
die

Meaning

[1] Storage space for incoming e-mails or phone calls

[1] Speicherplatz für eingehende E-Mails oder Telefonate

Examples

[1] "The next morning I found your answer in my mailbox, typed by the journalist" [2]

[1] „Am nächsten Morgen fand ich ihre Antwort in meiner Mailbox, getippt von der Journalistin.“[2]

Declension

1 Singular Plural
Nominativ die Mailbox die Mailboxen
Genitiv der Mailbox der Mailboxen
Dativ der Mailbox den Mailboxen
Akkusativ die Mailbox die Mailboxen

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary