Between Thursday 14 March and Tuesday 25 June the victim, a 31-year-old female, received a number of letters, leaflets and parcels to her home that are unwanted and often include abusive language.
Investigating officer PC Emily Sivyer, based at Milton Keynes police station, said: “I am keen to speak to the man shown in these images as I believe he may have information that could prove vital to this investigation.
“This offence is understandably distressing for the victim and I want to put a stop to this upsetting behaviour.
“If you recognise this man, please get in touch using our online form or by calling 101, quoting reference number 43190078391. Alternatively, you can contact the independent charity Crimestoppers anonymously online or by calling 0800 555 111.”