I was trying the read the mail using go-imap and go-message libraries, but for a particular mail I am getting
multipart: NextPart: EOF error on part, err := reader.NextPart() where reader is the mail.CreateReader.

content type of the email is as following. I got it from gmail client show original mail

Content-Type: multipart/mixed; boundary="-----SECBOUND"

-------SECBOUND
Content-Type: text/html
Content-Transfer-Encoding: 8bit

html content only

-------SECBOUND--