Python Email Automation: Send HTML Emails via Gmail SMTP

📧 Send Email Using Python (SMTP) — Simple and Powerful Script

Want to send emails directly from Python using SMTP? This simple script lets you send an email with:

• ✉ A subject
• 📝 Body content (HTML supported)
• 📎 Attachments (optional)
• 🔗 Links & inline images

Perfect for automation, newsletters, alerts, notifications, or bulk tools.

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📦 Step 1: Install Required Module (Optional)

Python comes with smtplib built-in, so no installation needed. But if you want to use HTML formatting safely, install:

pip install email-validator

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🔐 Step 2: Enable App Password (Gmail)

To send emails using Python, Gmail requires you to create an App Password. Follow these steps:

1. Open your Google Account:
   https://myaccount.google.com
2. Go to the Security section:
   https://myaccount.google.com/security
3. Turn on 2-Step Verification (if not already enabled).
   https://myaccount.google.com/signinoptions/two-step-verification
4. Scroll down to App Passwords.
   https://myaccount.google.com/apppasswords
5. Select Mail as the app.
6. Select your device name, or choose Other.
7. Click Generate.
8. Copy the 16-digit password shown.
9. Use this password in your Python script:
   GMAIL_PASS = "your-16-digit-app-password"

⚠️ Note: App Passwords only work if you have 2-Step Verification enabled.

For Outlook, Yahoo, Hotmail — same process.

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💻 Step 3: Python Email Script

Create a file named: send_mail.py and paste this code 👇

import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

sender_email = "your_email@gmail.com"
receiver_email = "receiver@example.com"
app_password = "your_app_password"

subject = "Test Email from Python"
body = """
<h2>Hello from Python! 👋</h2>
<p>This is an automated email sent using <strong>Python SMTP</strong>.</p>
<p>You can add:</p>
<ul>
<li>Images 🖼️</li>
<li>Links 🔗</li>
<li>HTML formatting 🎨</li>
</ul>
<p>Visit: <a href='https://example.com'>Click Here</a></p>
"""

msg = MIMEMultipart()
msg["From"] = sender_email
msg["To"] = receiver_email
msg["Subject"] = subject

msg.attach(MIMEText(body, "html"))

try:
    server = smtplib.SMTP("smtp.gmail.com", 587)
    server.starttls()
    server.login(sender_email, app_password)
    server.sendmail(sender_email, receiver_email, msg.as_string())
    server.quit()
    print("✅ Email Sent Successfully!")
except Exception as e:
    print("❌ Error:", e)

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⚙️ Step 4: Run the Script

python send_mail.py

Your email will be sent instantly 🚀

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🧠 How It Works

• Connects to Gmail SMTP server (587)
• Logs in using secure App Password
• Formats your email using HTML
• Sends the mail once and prints success

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💡 Extra Features You Can Add

• 📎 Attachments (PDF, Excel, Images)
• 📮 CC & BCC
• 📑 HTML Templates
• 🤖 Automated email bots

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🎯 Quick Summary

• Language: Python
• Protocol: SMTP
• Output: Sends email successfully

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