Developers spend significant time context-switching between terminals and web interfaces to handle email tasks. KTX CLI brings email functionality directly into your command line: sending, validating, templating, and bulk operations without leaving your workflow. This guide covers installation, core commands, and real-world automation patterns for deployment scripts, monitoring alerts, and CI/CD pipelines.
You are deep in a deployment script when you realize you need to send a status notification. The old approach: open a browser, log into your email service dashboard, fill out a form, send. That context switch breaks your flow and adds friction to every automated process that needs email capability.
KTX CLI solves this by bringing email directly into the terminal. It is a command-line tool from KIRIM.EMAIL that handles sending, validation, templating, and bulk operations from any shell environment. No browser, no web dashboard, no context switching.
The tool works on Linux, macOS, and Windows. It installs as a single binary with no runtime dependencies. Authentication works both interactively (browser-based) and non-interactively (API key), so you can use it in local development and server environments without different workflows.
This guide covers everything you need to get started and integrate it into real workflows.
What Can You Actually Do From the Terminal?
KTX CLI is not a stripped-down version of the web dashboard. It covers the full range of email operations you would normally handle in a browser.
Send individual emails with plain text or HTML content directly from a bash command. Subject lines, recipients, and content all passed as command arguments.
Validate email addresses against syntax, domain, and mailbox availability before adding them to any list. This catches typos, disposable domains, and role-based addresses before they damage your sender reputation. Pair this with KIRIM.EMAIL’s Email Validation API for a complete validation pipeline that covers both CLI-based checks and API-level verification.
Start by installing KTX CLI and connecting it to your KIRIM.EMAIL account at kirim.email/dev. Your first automated email send takes under a minute to configure.
Manage templates by creating, listing, and sending from reusable email templates with variable substitution. Update template content in KIRIM.EMAIL without touching any scripts.
Send in bulk from CSV files or piped data with personalized content per recipient. Each row in the CSV maps to one personalized email with variable substitution.
Schedule delivery for future timestamps so batch jobs can queue emails without sending immediately. The queue is managed server-side, not in your script.
Handle attachments including multiple files per send. Files are uploaded and attached server-side, so attachment size limits are generous compared to SMTP-based sending.
How Do You Set Up KTX CLI?
Installation
The fastest way to install is through npm:
npm install -g ktx-cli
If npm is not available or you prefer a standalone binary, download the latest release directly:
curl -L https://releases.kirim.email/ktx/latest/ktx-linux -o ktx
chmod +x ktx
sudo mv ktx /usr/local/bin/
The same binaries are available for macOS and Windows from the same release URL. Verify your installation:
ktx --version
After installation, run the help command to see all available subcommands:
ktx --help
This displays the full command reference with flags and examples.
Authentication
For local development, the interactive login flow opens a browser window for secure authentication:
ktx auth login
Your credentials are stored locally after authentication completes. For server environments where browser-based login is not practical, use an API key instead:
ktx auth set-key YOUR_API_KEY
API keys are available from your KIRIM.EMAIL dashboard under Settings. Treat the key like any other secret credential: store it in environment variables or a secrets manager rather than hardcoding it in scripts.
How Do You Send Your First Email?
Sending a basic email takes one command:
ktx send \
--to "[email protected]" \
--subject "Deployment Complete" \
--text "The application deployed successfully at $(date)"
For HTML content:
ktx send \
--to "[email protected]" \
--subject "Weekly Report" \
--html "<h1>Weekly Report</h1><p>Your summary is ready.</p>"
Both commands return immediately with a delivery confirmation or error message. Exit codes follow standard conventions: 0 for success, non-zero for failure. This makes error handling in scripts straightforward.
How Do You Validate Emails Before Sending?
Bad email addresses are not just a quality problem. They damage your sender reputation when bounces accumulate. KTX CLI validates addresses before you send:
ktx validate [email protected]
The output tells you whether the address is valid, invalid, or risky (disposable domain, role-based address).
For bulk validation from a file:
ktx validate --file emails.txt --output results.csv
The output CSV marks each address with its validation status. Integrate this into your signup flow or data import process to catch bad addresses before they enter your database. For teams processing large contact lists, KIRIM.EMAIL’s Email Validation API also handles batch validation at scale with higher throughput.
How Do You Use Templates?
Creating reusable templates reduces repetition and keeps your email content consistent:
ktx template create \
--name "deploy-notification" \
--subject "Deployment {{status}}: {{app_name}}" \
--html "App {{app_name}} deployed to {{environment}} at {{timestamp}}"
Send using the template with variable data passed as JSON:
ktx send \
--template "deploy-notification" \
--to "[email protected]" \
--data '{"app_name":"api-server","environment":"production","status":"Successful","timestamp":"2026-03-31T10:30:00Z"}'
This separates content management from script logic. Update the template in KIRIM.EMAIL without touching any scripts.
How Do You Send Bulk Emails From Scripts?
For batch operations, the bulk command handles multiple recipients with variable substitution:
ktx bulk send \
--file contacts.csv \
--subject "Monthly Statement for {{name}}" \
--text "Hello {{name}}, your balance is {{balance}}."
The CSV file should have columns matching your variable names. Each row generates one personalized email. Rate limiting is built in: bulk operations send with appropriate delays so you do not hit infrastructure limits accidentally.
What Does Real Automation Look Like?
The power of terminal-based email comes from integration with existing scripts and workflows. These are the patterns that produce immediate value.
CI/CD Pipeline Notifications
Add email notifications to deployment scripts:
#!/bin/bash
if deploy_app; then
ktx send \
--to "[email protected]" \
--subject "Deploy Successful: $(date '+%Y-%m-%d')" \
--text "Application deployed successfully at $(date)"
else
ktx send \
--to "[email protected]" \
--subject "Deploy Failed: $(date '+%Y-%m-%d')" \
--text "Deployment failed. Check pipeline logs for details."
fi
Server Monitoring Alerts
Monitor disk space and page operations when thresholds are crossed:
#!/bin/bash
USAGE=$(df / | tail -1 | awk '{print $5}' | sed 's/%//')
if [ $USAGE -gt 80 ]; then
ktx send \
--to "[email protected]" \
--subject "Disk Alert: ${USAGE}% Used" \
--text "Server disk usage is at ${USAGE}%. Immediate attention required."
fi
Scheduled Cron Reports
Send daily status reports without manual intervention:
#!/bin/bash
BACKUP_SIZE=$(du -sh /backups/latest | cut -f1)
BACKUP_DATE=$(date '+%Y-%m-%d %H:%M')
ktx send \
--to "[email protected]" \
--subject "Daily Backup Report - $BACKUP_DATE" \
--text "Backup completed successfully. Size: $BACKUP_SIZE"
Add this to crontab for automatic daily execution: 0 6 * * * /path/to/backup-report.sh
Database Migration Notifications
Alert engineering teams after schema changes:
#!/bin/bash
MIGRATION_COUNT=$(ls migrations/pending | wc -l)
if [ $MIGRATION_COUNT -gt 0 ]; then
ktx send \
--to "[email protected]" \
--subject "Database Migrations Applied" \
--text "$MIGRATION_COUNT migrations applied to production database."
fi
How Do You Schedule Emails for Later?
Queue emails for future delivery without external scheduling tools:
ktx send \
--to "[email protected]" \
--subject "Scheduled Maintenance Notice" \
--text "System maintenance begins in one hour." \
--schedule "2026-04-01T09:00:00Z"
The email sits in KIRIM.EMAIL’s queue until the scheduled time and delivers automatically. This is useful for batch jobs that prepare notifications in advance but should not send until a specific window.
How Do You Manage Multiple Environments?
For teams running staging and production environments, configuration profiles keep credentials separate:
ktx profile create staging --key STAGING_API_KEY
ktx profile create production --key PROD_API_KEY
# Send to staging
ktx send --profile staging --to "[email protected]" --subject "Test"
# Send to production
ktx send --profile production --to "[email protected]" --subject "Important Update"
This prevents accidentally sending test emails to real recipients.
How Does KTX CLI Compare to Other Tools?
KTX CLI is purpose-built for developers who need email capability embedded in shell scripts and automation pipelines. If you are evaluating it against alternatives, here is how the landscape looks.
SMTP-based tools (sendmail, Postfix, msmtp): These require operating your own mail server. You are responsible for DNS configuration, reverse DNS records, IP reputation management, and blacklist monitoring. KTX CLI delegates delivery to KIRIM.EMAIL’s infrastructure, which handles all of that for you. The tradeoff is your sending reputation is tied to KIRIM.EMAIL’s infrastructure rather than your own IP.
GUI-based email services: Services like Mailchimp and SendGrid offer robust APIs, but wrapping those APIs in shell scripts requires authentication headers, response parsing, and timeout handling. KTX CLI abstracts all of that into a single command. For a direct comparison, see KIRIM.EMAIL vs Mailchimp.
No-code automation platforms: Tools like n8n can send emails as part of workflows and can even integrate with KIRIM.EMAIL for more complex automation scenarios. KTX CLI complements this by giving you direct terminal access when you do not need a full workflow automation platform.
FAQ
What is the difference between KTX CLI and using sendmail or Postfix?
Sendmail and Postfix require you to operate your own mail server. That means maintaining server infrastructure, managing DNS records for reverse DNS, and monitoring blacklist status. KTX CLI delegates delivery to KIRIM.EMAIL’s infrastructure so you get reliable inbox delivery without the operational overhead of running a mail server.
Can KTX CLI handle attachments?
Yes. Use the --attach flag with one or more file paths separated by commas:
ktx send --to "[email protected]" --subject "Report" --text "Attached is your report." --attach "report.pdf,data.csv"
How do you handle errors in scripts?
Check the exit code after every send command. Standard shell error handling works:
if ktx send --to "[email protected]" --subject "Test" --text "Message"; then
echo "Email sent successfully"
else
echo "Failed to send email" >&2
exit 1
fi
Can KTX CLI be used in CI/CD systems like GitHub Actions or GitLab CI?
Yes. Install KTX CLI in your CI environment, store your API key as a secret, and add send commands to your pipeline scripts. This is one of the most common use cases.
Does KTX CLI support HTML templates with images?
KTX CLI sends the HTML content you provide. If your HTML references external images by URL, they load in most email clients. For inline images, base64 embedding in the HTML works with most providers but increases email size.
How do you send to multiple recipients from a single command without bulk mode?
Pass a comma-separated list to --to:
ktx send --to "[email protected],[email protected]" --subject "Update" --text "Message"
For larger batches, use the bulk command with a CSV file for better performance and tracking.
What happens if the API key is wrong or the account runs out of credits?
KTX CLI returns a non-zero exit code with an error message that describes the problem. For authentication failures, the error message is explicit. For credit exhaustion, the API returns a specific error code. Your scripts should check exit codes and log or alert on failures. A failed email send in a critical pipeline should not silently go unnoticed.
Can KTX CLI be used alongside language-specific email libraries?
Yes. KTX CLI is designed to complement, not replace, language-specific libraries. If your application sends emails through Python’s smtplib or Node.js’s Nodemailer, KTX CLI can still handle administrative emails: system alerts, cron job reports, and developer notifications. The CLI and library can coexist in the same system without conflict.
Why This Belongs in Your Workflow
KTX CLI is not replacing your email dashboard. It is filling the gap between automated scripts and email delivery. Deployment scripts, monitoring tools, cron jobs, and CI/CD pipelines all need email capability without requiring a human to open a browser.
The alternatives are worse. Wrapping raw API calls in shell scripts means writing authentication headers, parsing responses, and handling timeouts manually. Using personal Gmail accounts for transactional email violates Google’s terms of service and gets accounts banned. Running your own SMTP server means managing infrastructure, DNS, and blacklist monitoring full-time.
KTX CLI delegates delivery to KIRIM.EMAIL’s infrastructure. You get reliable inbox delivery from a platform built for deliverability. Your scripts get a clean interface that returns meaningful errors when something goes wrong.
Start with one script. Pick the monitoring alert or deployment notification that currently requires manual intervention and automate it with KTX CLI. Once that works, add it everywhere email belongs in your workflow.
If you are ready to move past manual email handling and want infrastructure that just works, set up your KTX CLI environment at here and start sending from your terminal today.
Hasbi Putra is Head of Marketing at KIRIM.EMAIL, email delivery infrastructure for developers and IT teams in Southeast Asia. KIRIM.EMAIL sends over 11 million emails per day from servers located entirely in Indonesia.
