18.64.123.108
server-18-64-123-108.nrt12.r.cloudfront.net
18.64.123.126
server-18-64-123-126.nrt12.r.cloudfront.net
18.64.123.75
server-18-64-123-75.nrt12.r.cloudfront.net
18.64.123.93
server-18-64-123-93.nrt12.r.cloudfront.net

2600:9000:274f:1200:15:a442:300:93a1
2600:9000:274f:1c00:15:a442:300:93a1
2600:9000:274f:600:15:a442:300:93a1
2600:9000:274f:9400:15:a442:300:93a1
2600:9000:274f:c200:15:a442:300:93a1
2600:9000:274f:ca00:15:a442:300:93a1
2600:9000:274f:e000:15:a442:300:93a1
2600:9000:274f:ea00:15:a442:300:93a1

inbound-smtp.us-east-1.amazonaws.com.