How to Send Emails from Python Using msmtp and Gmail

import subprocess
from datetime import datetime

def send_email_via_msmtp(recipient, subject, body, account="default"):
    """Send email using msmtp - no credentials needed!"""
    
    # Create email message with proper headers
    email_message = f"""From: system@localhost
To: {recipient}
Subject: {subject}
Date: {datetime.now().strftime('%a, %d %b %Y %H:%M:%S %z')}

{body}"""
    
    try:
        # Use msmtp command
        cmd = ['msmtp', '-a', account, recipient]
        
        result = subprocess.run(
            cmd, 
            input=email_message, 
            text=True,
            capture_output=True,
            check=True,
            timeout=30
        )
        
        print(f"✅ Email sent successfully to {recipient}")
        return True
        
    except subprocess.CalledProcessError as e:
        print(f"❌ msmtp failed: {e.stderr}")
        return False
    except subprocess.TimeoutExpired:
        print("❌ Email sending timed out")
        return False
    except Exception as e:
        print(f"❌ Unexpected error: {e}")
        return False

# Usage example
send_email_via_msmtp(
    "[email protected]",
    "Test Email from Python",
    "This email was sent using Python and msmtp!"
)

import subprocess
import os
from email.message import EmailMessage
from datetime import datetime

class MsmtpMailer:
    def __init__(self, account="default", sender="system@localhost"):
        self.account = account
        self.sender = sender
    
    def send_email(self, recipients, subject, body, attachments=None):
        """Send email with optional attachments via msmtp"""
        
        if isinstance(recipients, str):
            recipients = [recipients]
        
        success_count = 0
        
        for recipient in recipients:
            if self._send_to_recipient(recipient, subject, body, attachments):
                success_count += 1
        
        return success_count == len(recipients)
    
    def _send_to_recipient(self, recipient, subject, body, attachments):
        """Send email to a single recipient"""
        
        # Create email message
        msg = EmailMessage()
        msg.set_content(body)
        msg['Subject'] = subject
        msg['From'] = self.sender
        msg['To'] = recipient
        msg['Date'] = datetime.now().strftime('%a, %d %b %Y %H:%M:%S %z')
        
        # Add attachments
        if attachments:
            for attachment_path in attachments:
                if os.path.exists(attachment_path):
                    with open(attachment_path, 'rb') as f:
                        file_data = f.read()
                        file_name = os.path.basename(attachment_path)
                        
                        # Determine MIME type
                        if attachment_path.endswith(('.png', '.jpg', '.jpeg', '.gif')):
                            maintype, subtype = 'image', attachment_path.split('.')[-1]
                            if subtype == 'jpg': subtype = 'jpeg'
                        else:
                            maintype, subtype = 'application', 'octet-stream'
                        
                        msg.add_attachment(file_data, maintype=maintype, 
                                         subtype=subtype, filename=file_name)
        
        try:
            cmd = ['msmtp', '-a', self.account, recipient]
            
            result = subprocess.run(
                cmd,
                input=msg.as_string(),
                text=True,
                capture_output=True,
                check=True,
                timeout=30
            )
            
            print(f"✅ Email sent to {recipient}")
            return True
            
        except Exception as e:
            print(f"❌ Failed to send to {recipient}: {e}")
            return False

# Usage examples
mailer = MsmtpMailer()

# Simple email
mailer.send_email(
    "[email protected]",
    "Python Notification",
    "Server monitoring alert: CPU usage is high!"
)

# Email with multiple recipients and attachment
mailer.send_email(
    ["[email protected]", "[email protected]"],
    "Daily Report",
    "Please find the daily system report attached.",
    attachments=["system_report.pdf", "usage_chart.png"]
)

import psutil
import subprocess
from datetime import datetime

def check_system_and_alert():
    """Check system resources and send alerts if needed"""
    
    # Check CPU usage
    cpu_percent = psutil.cpu_percent(interval=1)
    memory = psutil.virtual_memory()
    disk = psutil.disk_usage('/')
    
    alerts = []
    
    if cpu_percent > 80:
        alerts.append(f"🔥 High CPU usage: {cpu_percent}%")
    
    if memory.percent > 85:
        alerts.append(f"💾 High memory usage: {memory.percent}%")
    
    if disk.percent > 90:
        alerts.append(f"💿 Low disk space: {disk.percent}% used")
    
    if alerts:
        subject = f"🚨 System Alert - {len(alerts)} issue(s) detected"
        
        body = f"""System Alert Report
Generated: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}

Issues Detected:
{''.join(f'• {alert}' for alert in alerts)}

System Summary:
• CPU Usage: {cpu_percent}%
• Memory Usage: {memory.percent}%
• Disk Usage: {disk.percent}%

Please investigate these issues promptly.
"""
        
        send_email_via_msmtp("[email protected]", subject, body)

# Run the check
check_system_and_alert()