IPA: /əˈdrɛsər/
KK: /əˈdrɛsər/
A person or machine that speaks to or communicates with someone, often in a formal way.
The addresser of the letter was unknown, leaving the recipient puzzled.
Addresser → It is formed from "address" (from Old French *adresser*, meaning to direct or aim) and "-er" (meaning a person who). An addresser is a person who directs or aims something, typically in the context of communication or sending a message.
Think of someone who 'directs' a message — that's what an addresser does, as they are the person aiming to communicate.