Phishing Scam: British Gas email
I received a 'Your Bill is now Ready' email which looked like it was sent by British Gas but my name, address and account number were wrong. Like a BG email the text instructed me to access my account via the button but the wording was odd, the button the wrong colour and anyway BG usually takes a few days to produce a bill. The email arrived soon after I submitted my meter readings so I'm wondering how the scammers knew.
Why wasn't the email sent straight to spam?
An email gets tagged as spam when some aspect of the message triggers the spam monitoring process (such as message content, spoofing of an email address etc. etc.).
In the case of a fake bill notification, the scammers may simply target the end of the month to send out such messages (rather than necessarily knowing anything about you individually).