
der Absender
sender
The person or organization that sends a letter, package, email, or another message.
Auf dem Umschlag stand kein Absender.
There was no sender written on the envelope.
sender
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sender
The person or organization that sends a letter, package, email, or another message.
Auf dem Umschlag stand kein Absender.
There was no sender written on the envelope.
'Absender' (sender) is derived from the separable verb 'absenden' (to send off). The ending '-er' refers to the person or institution that performs the action of sending. Literally, it is therefore 'the one who sends something off'.
Wer eine Nachricht absendet, ist der Absender.
Whoever sends a message is the sender.
The word 'Absender' (sender) is used very often on envelopes, packages, and forms. There it appears as the label for the field where you enter your own address.
Bitte tragen Sie hier den Absender ein.
Please enter the sender here.
Common phrases include 'Absender und Empfänger' (sender and recipient) as a pair on postal items. A letter without the sender's address is a 'Brief ohne Absender' (letter without a sender), or the note 'Absender unbekannt' (sender unknown) is used when an item cannot be delivered.
Der Postbote brachte den Brief zurück, weil der Absender unleserlich war.
The mail carrier brought the letter back because the sender was illegible.
station / sender
Sender and Absender can both refer to the person or institution that sends something. Sender is a general term for the sending side, especially when describing communication. On letters, packages, and emails, Absender is the usual and more precise term.

Auf jeder Nachricht sollte der Absender deutlich erkennbar sein.
The sender should be clearly identifiable on every message.
Bei jeder Nachricht übermittelt der Sender Informationen an einen Empfänger.
With every message, the sender conveys information to a recipient.