On a side note, I used to contact potential clients years ago and then GoDaddy marked my domain as spam and made me cough up $199. The email wasn't even sent from the same domain (google godaddy spam scam). I moved off to NetworkSolutions. Anyone sending cold emails, please beware of this.
Customizing would be looking up information about their company, researching their competitors, talking to people who know them, figuring out what kind of food they like, and then crafting an email to them. That is not spam. That is hustle and marketing.
Any unsolicited mail must have an unsubscribe link, even if you just email them once.
I thought it was a typo the first time you typed it, but I thought you should know when I saw it a second time.
The reason for this is really for mass emails. It really should not apply when you send a few hand-written emails to a few people.