Meanings of anonymous sender in English

The anonymous sender is likely writing glowing reviews of their own product.

The moderator claims that he received the picture from an anonymous sender.

As if on cue, a text message from an anonymous sender had come in.

As I waited, I wondered how much more harm the anonymous sender had intended.

But it was a message from an anonymous sender instead.

Hot Doc says it received the list from an anonymous sender and authorities have not confirmed its authenticity.

They want me to help them ferret out the anonymous sender, but what's the use of dragging me in?

Was Eric the anonymous sender?

Upon Ruth's writing-table rested a basket of delicate Marechal Niel buds, almost veiled in tender maiden-hair; the anonymous sender was not unknown.

Stephen Gielda, president of security information company PacketDerm LLC, received a copy of the program last week by e-mail from an anonymous sender.

Receiving this special treasure so unexpectedly from an anonymous sender in Berlin had filled me with a noxious blend of fear and bewilderment.

Questions, curious questions, were frequently asked by the anonymous sender of the reports; and to these her father replied by means of his private code.