52.216.107.187
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52.216.205.154
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52.216.211.109
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52.217.234.245
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52.217.37.235
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54.231.139.173
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54.231.82.81
s3-website-us-east-1.amazonaws.com

in1-smtp.messagingengine.com.
in2-smtp.messagingengine.com.