Guha, 58, claimed that the mails also warned him against criticising BJP president Amit Shah.
“Many people/ids sending identical mails warning me to ‘get ready for punishment (sic) by Divine Mahakal’ for being critical of the BJP,” he tweeted.
“I am also warned not to criticise Narendra Modi and Amit Shah who ‘are blessed & divine…chosen one by Divine Mahakal to change the world’,” he said.
“Before writing such blogs, comparing Mr Modi and Indira Gandhi, or Amit Shah and Sanjay Gandhi… You should understand the differences between them. Who are you to think, and write that way.
“You need to first understand the meaning of Divine chosen, and blessed by divine,” the mail read.
It also warned Guha “not to compare or insult” and “maintain the dignity of blessed persons.”
The historian, however, told PTI that such mails were a “routine affair” and it was “nothing serious”.