Want to send **emails from your Flask app** using Python? In this tutorial, I’ll show you **how to set up Flask-Mail** to send emails with Gmail SMTP, Outlook, or any custom mail server. Whether you're building a **contact form, password reset system, or notification emails**, this guide has you covered!

By the end of this video, you’ll know how to **configure Flask-Mail, send plain text and HTML emails, attach files, and use environment variables for security**.

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## ** What You’ll Learn in This Video:**
How to install and set up **Flask-Mail**
How to configure Flask to send **emails via SMTP**
How to send **plain text and HTML emails**
How to attach **files and images** to emails
How to use **environment variables** for secure email credentials

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## ** Prerequisites**
**Python Installed** ([Download Python](https://www.python.org/downloads/))
**Flask Installed** (`pip install flask`)
**Basic Flask knowledge**
A **Gmail or any SMTP email account**

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## ** Step 1: Install Flask and Flask-Mail**
First, install the required packages:

```bash
pip install flask flask-mail
```

---

## ** Step 2: Configure Flask-Mail**
Create a **Flask app** and set up the email configuration:

```python
from flask import Flask, render_template
from flask_mail import Mail, Message

app = Flask(__name__)

# Email Configuration
app.config["MAIL_SERVER"] = "smtp.gmail.com" # SMTP Server
app.config["MAIL_PORT"] = 587 # Port for TLS
app.config["MAIL_USE_TLS"] = True
app.config["MAIL_USE_SSL"] = False
app.config["MAIL_USERNAME"] = "[email protected]" # Your email
app.config["MAIL_PASSWORD"] = "your_password" # App password or actual password
app.config["MAIL_DEFAULT_SENDER"] = "[email protected]"

mail = Mail(app)

@app.route("/send_email")
def send_email():
msg = Message(
"Hello from Flask",
recipients=["[email protected]"]
)
msg.body = "This is a test email sent from a Flask app!"

try:
mail.send(msg)
return "Email sent successfully!"
except Exception as e:
return str(e)

if __name__ == "__main__":
app.run(debug=True)
```

---

## ** Step 3: Secure Your Credentials with Environment Variables**
**Never store email credentials in your code**. Use environment variables instead:

1⃣ Create a **`.env` file** in your project folder:

```
[email protected]
MAIL_PASSWORD=your_secure_password
```

2⃣ Install **python-dotenv** to load environment variables:

```bash
pip install python-dotenv
```

3⃣ Modify your code to use these variables:

```python
import os
from dotenv import load_dotenv

load_dotenv()

app.config["MAIL_USERNAME"] = os.getenv("MAIL_USERNAME")
app.config["MAIL_PASSWORD"] = os.getenv("MAIL_PASSWORD")
```

---

## ** Step 4: Send HTML Emails**
Want to send **styled emails**? Modify the `msg.body` to `msg.html`:



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## ** Step 5: Attach Files to Emails**
You can also send **attachments (PDFs, images, etc.)**:

```python
with app.open_resource("document.pdf") as attachment:
msg.attach("document.pdf", "application/pdf", attachment.read())
```

---

## ** Step 6: Send Emails via Outlook, Yahoo, or Custom SMTP**
Modify the **SMTP settings**:

**Gmail SMTP**
```
MAIL_SERVER = "smtp.gmail.com"
MAIL_PORT = 587
```

**Outlook SMTP**
```
MAIL_SERVER = "smtp.office365.com"
MAIL_PORT = 587
```

**Yahoo SMTP**
```
MAIL_SERVER = "smtp.mail.yahoo.com"
MAIL_PORT = 465
MAIL_USE_SSL = True
```

**Custom SMTP Server**
Replace `MAIL_SERVER` and `MAIL_PORT` with your **email provider's SMTP settings**.

---

## ** Common Issues & Fixes**
**SMTPAuthenticationError (535, ‘Incorrect password’)**
**Fix:** Enable **App Passwords** in Gmail settings (Google may block less secure apps).

**smtplib.SMTPConnectError: (421, ‘Too many connections’)**
**Fix:** Use a delay between emails or a mail queue like Celery.

**Email going to Spam?**
**Fix:** Use a valid sender email and **avoid spammy keywords** in your subject line.

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## ** Who Is This Tutorial For?**
Developers building **Flask apps that send emails**
Anyone creating **contact forms, notifications, or authentication systems**
Python beginners looking to learn **SMTP and Flask-Mail**

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## ** More Flask Tutorials:**
**How to Build a Flask API** → [Watch Now]
**How to Deploy a Flask App with Nginx & Gunicorn** → [Watch Now]
**How to Connect Flask with MySQL** → [Watch Now]

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## ** Like, Share & Subscribe!**
If this tutorial helped you, please **LIKE, SHARE, and SUBSCRIBE** for more **Flask and Python tutorials**!

Have questions? Drop them in the **comments** below!

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### ** Hashtags:**
#Flask #Python #FlaskMail #EmailAutomation #SMTP #PythonSMTP #FlaskTutorial #GmailSMTP #FlaskAPI

Now you can **send emails from your Flask app** like a pro!