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Re:Twilio to Acquire Sendgrid by no1youknowz on Monday October 15, 2018 @05:54PM (#18224174)
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

[1]: https://forums.aws.amazon.com/thread.jspa?messageID=538207

[2]: https://forums.aws.amazon.com/thread.jspa?threadID=220517

Re:Twilio to Acquire Sendgrid by adrr on Monday October 15, 2018 @07:46PM (#18225146)
Also if your sending that amount of emails, you want your own IP. Maybe even two IPs, One for transactional and one for marketing.
Re:Twilio to Acquire Sendgrid by robjan on Monday October 15, 2018 @08:44PM (#18225471)
SES allows you to purchase dedicated IPs