Many of their IPs have been blacklisted by spammers. When I last tried to use them for marketing purposes with paying clients, it was really hit and miss. See

Many of their IPs have been blacklisted by spammers. When I last tried to use them for marketing purposes with paying clients, it was really hit and miss. See below. They are old links, but serves my point. [0]: https://forums.aws.amazon.com/thread.jspa?threadID=233001 https://forums.aws.amazon.com/thread.jspa?threadID=233001 [1]: https://forums.aws.amazon.com/thread.jspa?messageID=538207 https://forums.aws.amazon.com/thread.jspa?messageID=538207 [2]: https://forums.aws.amazon.com/thread.jspa?threadID=220517 https://forums.aws.amazon.com/thread.jspa?threadID=220517