Email Delivery

Every new SES account starts in a sandbox that makes it useless for real sending. Getting out of it, and staying out, is the whole game.

Authentication is what separates mail that arrives from mail that is filtered. Three records, one alignment rule, and an order that matters.

SES will suspend a sender whose bounce or complaint rates climb. Handling those events is not optional infrastructure, it is the price of the sending limits.

Almost every cloud provider blocks outbound port 25 by default. Here is why, which platforms do it, and when an open port 25 account is genuinely the right answer.