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EC2's IP range is scorched earth, yes.

SES is in a separate set of IP ranges, and their feedback loops with major ISPs lets Amazon manage their reputation much more closely.

True, but we switched from SES to Mandrill because of delivery problems from SES.

Mandrill was way better, but now it looks like we need to move again. (And our complaint % on Mandrill was somewhere around 0.01%)

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