sparkpost.comは安全ですか？

This type of website is often mislabeled as spam. They are a transactional email service - think of it as a developers MailChimp to create process orientated emails like payment confirmations.. They are entirely legitimate, but sometimes bad guys are able to create fake accounts and use the service. They are super anti-spammers using their service and have very strict policies for users. If you have found someone using their service for spam, you can report it here https://www.sparkpost.com/report-abuse/

Spam message: "Your executive input needed in corporate citizenship research." From the message header: ***** ([52.36.127.224]). The IP address traces to "Message Systems", and ***** is a part of that. "Email Delivery Service and Transactional Mail (Spam). The domain contact address per ICANN: (Message Systems) - 9130 Guilford Road Suite 100, Columbia MD 21046, is actually the office of an OB\GYN clinic. Unless the contact has a desk there, I'd say it's a scam.

AVOID SPARKPOST SparkPost is a new Scammer in the place of Email Marketing. They canceled our account only 48 hours after payment claiming that our complaint rate was too high. Out of ***** emails sent, we had 150 bounces = 0.5% which is a very low bounce rate in any given industry. (we have made a screenshot showing these data). The way they communicate with us is like a Police Investigation, or even worst since they assume clearly that you are guilty! On Top of this, You can see on the Home Page of their website that they use very poor Marketing Pratices : Welcome Mandrill Customers! Here’s your migration guide. They want to take over the customers of Mandrill, their main competitor, with agressive Marketing. Don't be fooled by their low prices, there is NO service behind, and they use scammer practices