AWS SES SMTP Credentials
Generator & Converter
Instantly derive your Amazon SES SMTP password from an AWS IAM Secret Access Key using the official AWS Signature Version 4 HMAC-SHA256 algorithm.
Your AWS Secret Access Key is processed strictly within your browser using SigV4 HMAC-SHA256. No credentials ever touch our servers or network.
AWS IAM Credentials
Enter your IAM user credentials to derive the SES SMTP password
This serves directly as your SMTP Username.
Never sent to any server. Computed with client-side SHA256 HMAC.
SES SMTP Credentials
Ready-to-use mail server configuration
Ready-to-Use Code Snippets
Copy pre-populated configuration into your application
# Amazon SES SMTP Configuration
SMTP_HOST=email-smtp.us-east-1.amazonaws.com
SMTP_PORT=587
SMTP_USER=YOUR_AWS_ACCESS_KEY_ID
SMTP_PASSWORD=YOUR_GENERATED_SMTP_PASSWORD
SMTP_SECURE=false
SMTP_ENCRYPTION=STARTTLS
AWS_SES_REGION=us-east-1How to Generate & Use AWS SES SMTP Credentials
Follow these 4 simple steps to generate AWS IAM credentials and configure your mail server or application.
Create an IAM User
Open the AWS IAM Console, navigate to Users → Create User. Provide a name like ses-smtp-sender.
Attach SES Policy
Attach the AmazonSESFullAccess managed policy or grant granular permissions for ses:SendRawEmail.
Generate Access Keys
In the "Security credentials" tab, create an Access Key (CLI / Third-party). Copy the Access Key ID and Secret Access Key.
Derive & Deploy
Paste your Secret Key into this tool above. Copy the derived SMTP Password directly into your app, .env, Nodemailer, or mail server.
How the AWS SES Password Derivation Works
Amazon SES utilizes an HMAC-SHA256 key-derivation chain based on AWS Signature Version 4. Here is the exact calculation in Node.js:
import crypto from "node:crypto";
function sign(key, message) {
return crypto.createHmac("sha256", key).update(message, "utf8").digest();
}
export function generateSmtpPassword(secretAccessKey, region) {
const date = "11111111";
const service = "ses";
const terminal = "aws4_request";
const message = "SendRawEmail";
// 5-stage HMAC-SHA256 derivation chain:
let signature = sign("AWS4" + secretAccessKey, date);
signature = sign(signature, region);
signature = sign(signature, service);
signature = sign(signature, terminal);
signature = sign(signature, message);
// Prepend Version 4 marker byte (0x04) and Base64 encode:
const v4Buffer = Buffer.concat([Buffer.from([0x04]), signature]);
return v4Buffer.toString("base64");
}The password is tied specifically to the target AWS Region (e.g. us-east-1 vs eu-west-1). Generating for the wrong region will result in authentication errors.
It is mathematically impossible to reverse an Amazon SES SMTP password back into the original AWS Secret Access Key due to one-way SHA-256 HMAC properties.
AWS SES SMTP Derivation FAQ
Everything you need to know about Amazon SES authentication, IAM configuration, ports, and troubleshooting.
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