This company is the pits. I get so much spam from them (from their clients) it is unreal. Spam is rare from the likes of Mailchimp, ActiveCampaign, Aweber etc but Sendgrid is incessant. They are a magnet for spammers. You send them an email to report it and their standard answer is to unsubscribe. Are you joking? Unsubscribe from something you never subscribed to? Doing so will just tell the spammer your email address is active. They don't seem to understand how spam works and the fact that by reporting it you're actually doing them a favour.