It includes 6 things that explain why it is a spam. Andrew Ludgate’s first note is that there is a “Click Here” text in the middle of the message. The second note says that there is an “opt-out” banner which indicates it is an ad. Next, there is a unique ID included in the email.
Fourth, the message does not contain any information regarding who sent the email. The URL is the fifth indication. It is a random sub-domain and it ends with .info. Lastly, everything in the email is an image except for the unique ID.
Source: Sophos

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