Email Infrastructure, End to End

Understand the machinery under every send: the sending stack, the SMTP protocol, the DNS records receivers check, and the AWS SES delivery layer.

4 stepsabout 8 min total

The machinery behind sending: domains, DNS, SMTP relays, IPs, and reputation. Here is how the pieces fit, and why the app-wrapper model struggles.

SMTP is the protocol that transmits every email. Here is the handshake it runs, the reply codes it returns, and what they tell you when mail fails.

Every deliverability check starts in your DNS. Here is what each email record does, MX, PTR, SPF, DKIM, DMARC, and how they work together.

Amazon SES is a cloud SMTP relay that sends at scale without per-mailbox limits. Here is what it gives cold email, and what it still leaves to you.