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d-subrahmanyam/email-sending

Name: email-sending
Author: d-subrahmanyam

.agents/skills/email-sending/SKILL.md

npx skillsauth add d-subrahmanyam/deno-fresh-microservices email-sending

Clean

TrivyContainer and dependency vulnerability scanner

Clean

SemgrepStatic code analysis for vulnerabilities

Clean

mcp-scan (Snyk)Model Context Protocol security validation

Skipped

Snyk (dep)Open source security scanning

Skipped

Socket.devSupply chain security analysis

Skipped

VirusTotalMulti-engine malware detection

Skipped

CrowdStrikeAdvanced threat intelligence

Skipped

OSV-ScannerOpen Source Vulnerability database check

Skipped

OWASP Dep-Check

Email Sending

Node.js (Nodemailer)

import nodemailer from 'nodemailer';

const transporter = nodemailer.createTransport({
  host: process.env.SMTP_HOST,
  port: 587,
  secure: false, // true for 465
  auth: { user: process.env.SMTP_USER, pass: process.env.SMTP_PASS },
});

await transporter.sendMail({
  from: '"My App" <[email protected]>',
  to: '[email protected]',
  subject: 'Welcome!',
  html: '<h1>Welcome</h1><p>Thanks for signing up.</p>',
});

Transactional Email Services

Resend (recommended for simplicity)

import { Resend } from 'resend';

const resend = new Resend(process.env.RESEND_API_KEY);

await resend.emails.send({
  from: 'My App <[email protected]>',
  to: ['[email protected]'],
  subject: 'Welcome!',
  html: '<h1>Welcome</h1>',
});

SendGrid

import sgMail from '@sendgrid/mail';
sgMail.setApiKey(process.env.SENDGRID_API_KEY!);

await sgMail.send({
  to: '[email protected]',
  from: '[email protected]',
  templateId: 'd-abc123',        // Dynamic template
  dynamicTemplateData: { name: 'John', link: resetUrl },
});

Amazon SES (via AWS SDK v3)

import { SESv2Client, SendEmailCommand } from '@aws-sdk/client-sesv2';

const ses = new SESv2Client({ region: 'us-east-1' });
await ses.send(new SendEmailCommand({
  FromEmailAddress: '[email protected]',
  Destination: { ToAddresses: ['[email protected]'] },
  Content: {
    Simple: {
      Subject: { Data: 'Welcome!' },
      Body: { Html: { Data: htmlContent } },
    },
  },
}));

Email Templates

React Email (recommended for React projects)

// emails/welcome.tsx
import { Html, Head, Body, Container, Text, Button } from '@react-email/components';

export function WelcomeEmail({ name, url }: { name: string; url: string }) {
  return (
    <Html>
      <Head />
      <Body style={{ fontFamily: 'sans-serif' }}>
        <Container>
          <Text>Welcome, {name}!</Text>
          <Button href={url} style={{ background: '#000', color: '#fff', padding: '12px 20px' }}>
            Get Started
          </Button>
        </Container>
      </Body>
    </Html>
  );
}

// Render to HTML string
import { render } from '@react-email/render';
const html = await render(<WelcomeEmail name="John" url="https://app.com" />);

MJML (framework-agnostic)

import mjml2html from 'mjml';

const { html } = mjml2html(`
  <mjml>
    <mj-body>
      <mj-section>
        <mj-column>
          <mj-text>Welcome, {{name}}!</mj-text>
          <mj-button href="{{url}}">Get Started</mj-button>
        </mj-column>
      </mj-section>
    </mj-body>
  </mjml>
`);

Python

from email.message import EmailMessage
import aiosmtplib

msg = EmailMessage()
msg["From"] = "[email protected]"
msg["To"] = "[email protected]"
msg["Subject"] = "Welcome!"
msg.set_content("Welcome!", subtype="html")

await aiosmtplib.send(msg, hostname=SMTP_HOST, port=587,
    username=SMTP_USER, password=SMTP_PASS, start_tls=True)

Java (Spring Mail)

@Service
public class EmailService {
    @Autowired private JavaMailSender mailSender;
    @Autowired private TemplateEngine templateEngine; // Thymeleaf

    public void sendWelcome(String to, String name) {
        var ctx = new Context();
        ctx.setVariable("name", name);
        String html = templateEngine.process("welcome", ctx);

        var message = mailSender.createMimeMessage();
        var helper = new MimeMessageHelper(message, true);
        helper.setTo(to);
        helper.setFrom("[email protected]");
        helper.setSubject("Welcome!");
        helper.setText(html, true);
        mailSender.send(message);
    }
}

Anti-Patterns

| Anti-Pattern | Fix | |--------------|-----| | Sending email in request handler | Use background job queue (BullMQ, Celery) | | No retry on transient failure | Retry with exponential backoff (3 attempts) | | Hardcoded from address | Use env var, match verified domain | | HTML without plain text fallback | Always include both HTML and text versions | | No unsubscribe header | Add List-Unsubscribe header (required by Gmail/Yahoo) | | Sending from unverified domain | Set up SPF, DKIM, DMARC records |

Production Checklist

[ ] SPF, DKIM, DMARC DNS records configured
[ ] Domain verified with email provider
[ ] List-Unsubscribe header on marketing emails
[ ] Bounce and complaint handling (webhook)
[ ] Email sending via background queue (not in request)
[ ] Rate limiting to stay within provider limits
[ ] Plain text fallback for all HTML emails
[ ] Template preview/testing before deploy

d-subrahmanyam/email-sending

.agents/skills/email-sending/SKILL.md

Email sending integration. Covers Nodemailer (Node.js), Spring Mail (Java), smtplib (Python). Transactional email services: SendGrid, Amazon SES, Resend. Template engines: MJML, React Email. USE WHEN: user mentions "send email", "nodemailer", "SMTP", "SendGrid", "SES", "Resend", "transactional email", "email template", "MJML", "React Email", "spring mail" DO NOT USE FOR: push notifications - use `push-notifications`; SMS - different channel; email parsing/reading

development

Updated Apr 16, 2026

$ install --global

skillsauth

npx skillsauth add d-subrahmanyam/deno-fresh-microservices email-sending

Install this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.

Security Scan Results

3 of 9 scanners reported clean

Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.

Scanners Passed

Scanners in report

Clean

TrivyContainer and dependency vulnerability scanner

95%

Clean

SemgrepStatic code analysis for vulnerabilities

95%

Clean

mcp-scan (Snyk)Model Context Protocol security validation

95%

Skipped

Snyk (dep)Open source security scanning

50%

Skipped

Socket.devSupply chain security analysis

50%

Skipped

VirusTotalMulti-engine malware detection

50%

Skipped

CrowdStrikeAdvanced threat intelligence

50%

Skipped

OSV-ScannerOpen Source Vulnerability database check

50%

Skipped

OWASP Dep-Check

50%

Last scanned: Apr 24, 2026, 8:54 PM1.8s1 file scanned

SKILL.md

name:: email-sending
description:: |
smtplib (Python). Transactional email services:: SendGrid, Amazon SES, Resend.
Template engines:: MJML, React Email.
USE WHEN:: user mentions "send email", "nodemailer", "SMTP", "SendGrid",
DO NOT USE FOR:: push notifications - use `push-notifications`;
allowed-tools:: Read, Grep, Glob, Write, Edit

Email Sending

Node.js (Nodemailer)

import nodemailer from 'nodemailer';

const transporter = nodemailer.createTransport({
  host: process.env.SMTP_HOST,
  port: 587,
  secure: false, // true for 465
  auth: { user: process.env.SMTP_USER, pass: process.env.SMTP_PASS },
});

await transporter.sendMail({
  from: '"My App" <[email protected]>',
  to: '[email protected]',
  subject: 'Welcome!',
  html: '<h1>Welcome</h1><p>Thanks for signing up.</p>',
});

Transactional Email Services

Resend (recommended for simplicity)

import { Resend } from 'resend';

const resend = new Resend(process.env.RESEND_API_KEY);

await resend.emails.send({
  from: 'My App <[email protected]>',
  to: ['[email protected]'],
  subject: 'Welcome!',
  html: '<h1>Welcome</h1>',
});

SendGrid

import sgMail from '@sendgrid/mail';
sgMail.setApiKey(process.env.SENDGRID_API_KEY!);

await sgMail.send({
  to: '[email protected]',
  from: '[email protected]',
  templateId: 'd-abc123',        // Dynamic template
  dynamicTemplateData: { name: 'John', link: resetUrl },
});

Amazon SES (via AWS SDK v3)

import { SESv2Client, SendEmailCommand } from '@aws-sdk/client-sesv2';

const ses = new SESv2Client({ region: 'us-east-1' });
await ses.send(new SendEmailCommand({
  FromEmailAddress: '[email protected]',
  Destination: { ToAddresses: ['[email protected]'] },
  Content: {
    Simple: {
      Subject: { Data: 'Welcome!' },
      Body: { Html: { Data: htmlContent } },
    },
  },
}));

Email Templates

React Email (recommended for React projects)

// emails/welcome.tsx
import { Html, Head, Body, Container, Text, Button } from '@react-email/components';

export function WelcomeEmail({ name, url }: { name: string; url: string }) {
  return (
    <Html>
      <Head />
      <Body style={{ fontFamily: 'sans-serif' }}>
        <Container>
          <Text>Welcome, {name}!</Text>
          <Button href={url} style={{ background: '#000', color: '#fff', padding: '12px 20px' }}>
            Get Started
          </Button>
        </Container>
      </Body>
    </Html>
  );
}

// Render to HTML string
import { render } from '@react-email/render';
const html = await render(<WelcomeEmail name="John" url="https://app.com" />);

MJML (framework-agnostic)

import mjml2html from 'mjml';

const { html } = mjml2html(`
  <mjml>
    <mj-body>
      <mj-section>
        <mj-column>
          <mj-text>Welcome, {{name}}!</mj-text>
          <mj-button href="{{url}}">Get Started</mj-button>
        </mj-column>
      </mj-section>
    </mj-body>
  </mjml>
`);

Python

from email.message import EmailMessage
import aiosmtplib

msg = EmailMessage()
msg["From"] = "[email protected]"
msg["To"] = "[email protected]"
msg["Subject"] = "Welcome!"
msg.set_content("Welcome!", subtype="html")

await aiosmtplib.send(msg, hostname=SMTP_HOST, port=587,
    username=SMTP_USER, password=SMTP_PASS, start_tls=True)

Java (Spring Mail)

@Service
public class EmailService {
    @Autowired private JavaMailSender mailSender;
    @Autowired private TemplateEngine templateEngine; // Thymeleaf

    public void sendWelcome(String to, String name) {
        var ctx = new Context();
        ctx.setVariable("name", name);
        String html = templateEngine.process("welcome", ctx);

        var message = mailSender.createMimeMessage();
        var helper = new MimeMessageHelper(message, true);
        helper.setTo(to);
        helper.setFrom("[email protected]");
        helper.setSubject("Welcome!");
        helper.setText(html, true);
        mailSender.send(message);
    }
}

Anti-Patterns

Production Checklist

[ ] SPF, DKIM, DMARC DNS records configured
[ ] Domain verified with email provider
[ ] List-Unsubscribe header on marketing emails
[ ] Bounce and complaint handling (webhook)
[ ] Email sending via background queue (not in request)
[ ] Rate limiting to stay within provider limits
[ ] Plain text fallback for all HTML emails
[ ] Template preview/testing before deploy

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# Clone the repo
git clone https://github.com/d-subrahmanyam/deno-fresh-microservices.git

# Copy into Claude Code skills folder (global)
cp -r deno-fresh-microservices/.agents/skills/email-sending ~/.claude/skills/

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Repository

d-subrahmanyam/deno-fresh-microservices

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