How to Send Bulk Messages on Telegram Using Session Files

Bulk messaging on Telegram can be a powerful tool for announcements, updates, or marketing, but it must be done carefully to avoid triggering Telegram’s anti-spam mechanisms or violating their terms of service. This guide shows you how to leverage session files with Python libraries like Telethon, respect rate limits, and follow best practices for safe, effective bulk messaging.

1. What Is a Session File?

A session file (e.g., my_session.session) stores your Telegram API credentials and authorization data. It allows scripts to log in programmatically without re-entering your phone number or code each time. Libraries like Telethon and Pyrogram use session files for persistent connections.

2. Why Use Session Files for Bulk Messaging?

Persistent Login: Keep your bot or script connected across runs without manual authentication.
Multi-Account Handling: Manage multiple session files if you run campaigns from different accounts.
Automated Workflows: Schedule and automate message dispatches using cron jobs or task schedulers.

3. Sample Telethon Script for Bulk Messaging

The following example uses Telethon to send a message to a list of user IDs stored in recipients.txt:


from telethon.sync import TelegramClient

import asyncio



api_id = 123456  # Your API ID

api_hash = 'your_api_hash'  # Your API Hash

session_file = 'my_session'  # Without .session extension



async def main():

client = TelegramClient(session_file, api_id, api_hash)

await client.start()


with open('recipients.txt', 'r') as f:

    recipients = [line.strip() for line in f if line.strip()]


for user_id in recipients:

    try:

        await client.send_message(int(user_id), 'Hello! This is a bulk update.')

        await asyncio.sleep(2)  # Respect rate limits

    except Exception as e:

        print(f'Failed to send to {user_id}:', e)


await client.disconnect()



asyncio.run(main())

    Tip: Always include a delay (asyncio.sleep()) to stay within Telegram’s rate limits and avoid temporary bans.
  

4. Best Practices for Safe Bulk Messaging

Respect Rate Limits: Keep a delay of 1–3 seconds between messages. Too fast can trigger “Flood” errors.
Segment Your Audience: Break your recipient list into smaller batches to reduce load and risk.
Provide Value: Ensure messages are relevant and non-spammy. Include unsubscribe instructions if appropriate.
Monitor Failures: Log errors and temporarily pause or retry failed sends to avoid repeating issues.
Comply with Telegram’s Terms: Avoid unsolicited promotions. Only message users who have opted in or expect updates.

5. Handling Multiple Session Files

If you need to send larger volumes, you can use multiple Telegram accounts with separate session files:

Create separate sessions (e.g., session1.session, session2.session).
Distribute your recipient list across sessions.
Rotate between clients in your script to balance load and avoid single-account limits.

    Note: Managing multiple accounts increases complexity—ensure each account follows best practices to maintain deliverability.
  

6. Monitoring and Analytics

Track delivery status and engagement:

Use Telegram’s message views and read receipts for channels.
Log successful sends and failures to a file or database for analysis.
Adjust messaging frequency, content, or segmentation based on performance data.

Conclusion

Sending bulk messages on Telegram using session files can streamline your communication workflows, but it must be done responsibly. By respecting rate limits, segmenting your audience, and adhering to Telegram’s policies, you can achieve efficient, non-spammy bulk messaging. Always monitor performance and maintain transparency with your recipients to build trust and avoid bans.