That’s why you sign it as Ena B. Madeupname.

Edit: TIL the origin of this joke:

At one point the magazine printed many letters from a reader named “Ena B. Maxwell”, of “Headington Hall, Oxfordshire”, the real-life address of Robert Maxwell. The letters were written by the Private Eye editorial team, and the pseudonym was attached to suggest that he was writing to the magazine under an assumed identity. The letters were careful not to make any legally actionable claims, instead containing material that was impertinent or absurd in order to ridicule Maxwell. “Ena” still makes occasional appearances in the letters column with varying surnames. Maxwell himself was “Cap’n Bob”, a mocking reference to his ownership of a large yacht and regular appearances in a ship captain’s cap, and to his former rank of captain in the British Army.