No, it is not a message from the deposed King of Nigeria.
On Sunday, writer Emmeline May shared a screenshot, of what she claimed was a spam email she'd received.
The message read (errors included):
I am the Prime Minister of the United Kingdom .
I have an important message to deliver to you.
You have been chosen for a special program,
all that is required of you is for you to reply to this
email. I also have a warning.
Non Compliance is rewarded with punishment, heed my words.
I look forward to seeing you soon - The PM
Emmeline May's tweet has been shared over 10,000 times and liked by more than 34,000 accounts.
Evidently, this cannot really be Theresa May because it does not include the tell-tale phrase 'Brexit means Brexit'.
The subject of the email appeared to be 'Emergency Broadcast Alert'.
While it may seem ridiculous that anyone would fall for that, according to Comic Herley, a researcher at Microsoft, the intentional inclusion of errors is a technique used by phishing scammers.
The mistakes work as a filtering system. Anyone who immediately identifies the scam as a scam, will not reply.
Anyone who falls for something, even when it contains glaring errors, is prime chum for the phishing scammers.