The German word for mail is Post. It is used in the same way as in English, to refer to the system of sending and receiving letters and packages. For example, you can say 'Ich muss zur Post gehen, um ein Paket abzuholen' (I have to go to the post office to pick up a package).
I am going to the post office
This sentence is an example of present tense in German expressing an action that someone is doing or going to do. It introduces the specific location 'Post' which stands for the post office.
The post office is closed
Here, 'Post' is used as the subject of the sentence with 'ist geschlossen' describing its present state, which translates to ‘is closed’. This sentence also gives an idea about describing the condition of places in German language.
I am waiting for the mail
In this sample sentence, 'die Post' is translated to 'the mail', and 'warte auf' translates to 'waiting for'. This example shows the use of the verb 'warten auf' (to wait for) and the use of the definite article 'die' when referring to something specific.