📧 Email Checker

Email Checker is a Python-based CLI and Dockerized tool for validating email addresses — individually or in batches. It detects disposable email domains (updated automatically from a public source), integrates with cron for scheduled tasks, and runs smoothly in local and containerized environments.

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🚀 Features

• ✅ Validate a single email address from the CLI or Docker
• 📄 Batch check emails from CSV files (/input/*.csv)
• ὐ1 Update and store disposable domains for validation
• 🕒 Scheduled updates via cron (built-in)
• 🐳 Docker-ready for isolated use or integration
• 💻 Easy to install and use via pip or make

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📂 Source Code

The complete source code is available on GitHub.
Feel free to explore, contribute, or fork the project.

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📦 Installation (CLI version)

  pip install email-checker-mv

ὐ4 Uninstall

  pip uninstall email-checker-mv

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🛠️ CLI Commands

Command	Description
check_email someone@example.com	✅ Check a single email (default output)
check_email someone@example.com -S	✅ Check a single email (short output)
check_email someone@example.com -F	✅ Check a single email (full output)
check_batch	📄 Batch check .csv files in the input/ dir
update_domains	🔄 Update the list of disposable domains
set_user_config KEY=VAL	⚙️ Set a runtime config variable
get_user_config	🧾 Show current user config values

Disposable domains are fetched from Propaganistas/Laravel-Disposable-Email.

📄 CSV Format for check_batch

The check_batch command processes a CSV file located in the input/ directory and expects the following format:

• Delimiter: Must be a comma (,)
• Headers: Required columns are:
  • email – the email address to validate
  • status – must be one of the supported values below

Only rows with the appropriate status values will be processed. All others will be skipped.

🏷️ Supported status Values for check_batch

Status	Description
check	Check email with default verbosity
check S	Check email with short response
check F	Check email with full response
undefined	Alias for check, treated the same as check
undefined S	Alias for check S, runs with short verbosity
undefined F	Alias for check F, runs with full verbosity

✅ Example input file (input/emails.csv)

email,status
user1@example.com,check
user2@example.com,undefined
user3@example.com,check S
user4@example.com,undefined F

📤 Output

The output format is consistent across both check_email (CLI) and check_batch (CSV):

• When using CLI, results are printed to the terminal.
• When using batch, results are written to the status column in the CSV file.

You can safely rerun the same CSV file — already processed rows (anything except check, check S, check F, etc.) will be skipped.

📋 Possible values

Result Format	Meaning
valid	📥 Address exists and accepts emails
invalid|format	❌ Invalid email format (regex check failed)
invalid|non-ascii	❌ Email contains non-ASCII characters
invalid|disposable	🗑️ Disposable/temporary email address
invalid|mx	📡 No MX record found for the domain
invalid|smtp no-code: <msg>	🚫 SMTP connection was closed without a response
invalid|smtp <cat_short> <code>	⚙️ Default output: short type and SMTP code
invalid|smtp <cat>|<code>|<msg_short>	🧾 Short output: verbose type and short message
invalid|smtp <cat>|<code>|<msg>	📜 Full output: verbose type and full message

📝 These formats apply both in CLI and in .csv batch processing.

📦 SMTP Response Type Codes

Code	Meaning
HB / hard-bounce	❌ Hard bounce – Address does not exist
SB / soft-bounce	⚠️ Soft bounce – Temporary delivery issue
PE / protocol-error	🧩 Protocol error – SMTP syntax or protocol failure
UN / unknown	❓ Unknown – Unclassified or unknown SMTP response
NC / no-code	🔌 No code – Connection closed unexpectedly (no code)

📎 Note: check_batch rewrites the result to the "status" column in the output CSV file for each email.

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⚙️ Configurable Variables

Starting from version 0.4.0, you can dynamically modify runtime configuration parameters via CLI, manage.sh, or Makefile.

Available Configuration Keys

Variable	Description
MAX_EMAILS_PER_RUN	Maximum number of emails to process in one batch run
SMTP_FROM	Sender email used for SMTP HELO/EHLO
SMTP_TIMEOUT	Timeout for each SMTP connection (in seconds)
USE_EHLO	Use EHLO instead of HELO in SMTP handshake (true/false)
EHLO_DOMAIN	Custom domain for EHLO header
USE_RANDOM_FROM	Randomize sender email (true/false)
CUSTOM_FROM_DOMAIN	Domain used for random@domain.com when USE_RANDOM_FROM=true
DEBUG	Enable verbose debug output (true/false)

These can be set using:

# CLI
  set_user_config USE_EHLO=true

# manage.sh
  ./manage.sh -set_user_config USE_RANDOM_FROM=true

# Makefile
  make set_user_config key=DEBUG=true

To view the current configuration:

# CLI
  get_user_config

# manage.sh
  ./manage.sh -get_user_config

# Makefile
  make get_user_config

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🐳 Docker Usage

You can control Docker using either make or manage.sh.

▶️ manage.sh Script

Before using it, ensure it’s executable:

  chmod +x manage.sh

Command	Description
./manage.sh -start	🟢 Start the container with build
./manage.sh -stop	🛑 Stop the container
./manage.sh -destroy	⚠️ Remove container, images, volumes
./manage.sh -logs	📄 Tail cron logs
./manage.sh -batch	📬 Run batch email check
./manage.sh -check someone@example.com	✅ Run single email check
./manage.sh -check someone@example.com -S	✅ Run single email check (short output)
./manage.sh -check someone@example.com -F	✅ Run single email check (full output)
./manage.sh -update	🔄 Update list of disposable domains
./manage.sh -set_user_config KEY=VAL	⚙️ Set a single user config parameter
./manage.sh -get_user_config	🧾 Show current user config
./manage.sh -help	ℹ️ Show this help message

⚙️ Makefile Shortcuts

Use make help to list all commands.

Command	Description
./manage.sh -start	🟢 Start the container with build
./manage.sh -stop	🛑 Stop the container
./manage.sh -destroy	⚠️ Remove container, images, volumes
./manage.sh -logs	📄 Tail cron logs
./manage.sh -batch	📬 Run batch email check
./manage.sh -check someone@example.com	✅ Run single email check
./manage.sh -check someone@example.com -S	✅ Run single email check (short output)
./manage.sh -check someone@example.com -F	✅ Run single email check (full output)
./manage.sh -update	🔄 Update list of disposable domains
make set_user_config key=VAL	⚙️ Set a single user config parameter
make get_user_config	🧾 Show current user config
./manage.sh -help	ℹ️ Show this help message

📂 Cron Customization

You can edit the cron configuration directly inside the running container using:

  docker exec -it email_checker crontab -e

This allows advanced scheduling if needed.

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📄 License

This project is licensed under the MIT License.

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Thank you for using Email Checker! Contributions and feedback are welcome.