Hacker News Reader

I'm confused, does this use different IP addresses constantly? How is this mailserver able to send email without an IP based reputation? Is it just that Amazon is so giant other mega-corp email providers are wary to blacklist their IP range?

If so this is a wonderful way to send spam without ever worrying about IP reputation. I imagine it will be abused and then blacklisted quickly.

View on HN

The Lambda doesn't send or receive email directly, it uses SES.

SES handles this in a delegated way via DKIM signatures (Domain Keys Identified Mail).

The domain signing with DKIM still doesn't get you a valid IP reputation. It may help to gradually build one if it's the same IP over and over, but it's still a brand new IP suddenly sending mail from $domain. If it weren't an amazon IP it'd certainly get refused or at least marked as spam and hidden after acceptance.

Just another example of one set of rules for human people and another for corporate people. Either pledge yourself to a corporate feudal lord (amazon here) or suffer.

Reply on news.ycombinator.com