Bringing Ownership Back to Email

Personalized Bulk Email Scheduler on Your Own SMTP.

Send personalized email campaigns — CSV mail merges, newsletters, event invitations, and announcements — through your own custom SMTP account with automated send-rate throttling that protects your domain reputation. Your lists, your server, 100% your control.

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How it works

Staggered bulk email scheduling and CSV personalization in four simple steps

1. Import your CSV & merge tags

Upload recipient spreadsheets (CSV or Excel). Column headers automatically convert into personalized merge tags like {{first_name}} or {{company}}.

2. Personalize visual templates

Design responsive HTML or plain-text layouts with dynamic variables. Preview live, recipient-specific merges before scheduling dispatches.

3. Connect any custom SMTP

Bring your own SMTP server — Google Workspace, Microsoft 365, Amazon SES, Mailgun, or web hosting. No shared IP pools or deliverability penalties.

4. Throttle & schedule safely

Configure custom send intervals (e.g. 1 email every few minutes), daily sending windows, weekday restrictions, and blackout dates. Pause or retry anytime.

Why Schedule Bulk Emails with Your Own SMTP?

Traditional newsletter tools trap you in shared IP pools and opaque deliverability. trkl puts total control back into your hands.

Your reputation & deliverability stay yours

Because dispatches route exclusively through your authenticated server, your domain reputation, SPF, DKIM, and DMARC alignment remain completely uncompromised.

Transparent rate-limiting & throttling

Configure precise pacing to comfortably stay within your provider's hourly and daily sending quotas, eliminating sudden vendor suspensions.

Targeted mailouts, zero spam blasting

Designed for considered dispatches — invitations, client newsletters, customer notifications, and announcements sent as natural, personalized dispatches.

Security & Privacy First

Protected at Rest

  • SMTP Credentials Encrypted: Symmetrically encrypted using Libsodium (AES-256-GCM) with the encryption key held strictly on the server-side environment.
  • HMAC Address Indexing: Recipient email addresses are hashed via HMAC for lookups and duplicate prevention, protecting plaintext customer lists.
  • No Data Reselling: Your campaign and recipient lists persist only on your account until you delete them. We never sell or share data.
  • Hardened Protections: HTTPS enforcement, secure Argon2id password hashing, and rate-limited logins prevent brute force attacks.

You are responsible for your SMTP provider's limits and for having permission to contact recipients — see our Terms.

Simple, transparent pricing

Start scheduling free or unlock premium limits

Free Tier

$0 forever
  • Up to 5 active campaigns
  • Up to 500 recipient imports per 30 days
  • Fixed 45-minute send frequency
  • CSV & Excel import support
  • Visual HTML & Plain-Text templates
  • Includes small "Sent via trkl" promotional footer
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Most Popular

Premium Upgrade

$4.99 / month
  • Unlimited active campaigns
  • Unlimited recipient imports
  • Flexible send scheduling (custom intervals)
  • CSV & Excel import support
  • Visual HTML & Plain-Text templates
  • No promotional footers in dispatches
  • No minimum contract length
  • Priority support
Upgrade now

Frequently Asked Questions

Got questions about our bulk email scheduler and custom SMTP? We have answers.

What is a bulk email scheduler and how does custom SMTP work?

A bulk email scheduler allows you to pace and send personalized batch campaigns over time rather than blasting thousands at once. With trkl.email, you connect your own custom SMTP server (Google Workspace, Microsoft 365, Amazon SES, Mailgun, or web hosting SMTP). Emails are dispatched directly through your credentials, ensuring 100% ownership over your domain reputation and deliverability without shared IP pool penalties.

Can I connect Gmail, Google Workspace, Outlook, or Amazon SES?

Yes. Any standard SMTP server with username/password authentication and TLS/SSL encryption is supported. You can easily connect Google Workspace (via App Passwords), Microsoft 365 / Outlook, Amazon SES, Mailgun, Postmark, Brevo, or cPanel/shared hosting SMTP.

How does scheduled rate-limiting protect my sender reputation?

Blasting high volumes in seconds triggers spam filters and ISP blocks. trkl.email spaces your dispatches out across configurable intervals (e.g. 1 email every few minutes), respects daily sending hours, skips weekends if desired, and honors blackout calendar dates to keep your sending within provider quotas and warm up your domain safely.

Are my recipient email lists and SMTP credentials secure?

Yes. Your SMTP credentials are symmetrically encrypted at rest using Libsodium AES-256-GCM, with the key stored strictly in your server environment. Recipient lists are protected with HMAC-SHA256 duplicate indexing, and data is permanently erased when you delete a campaign. We never sell, rent, or share your contact data.

What features are included in the Free Tier vs Premium?

The Free Tier includes up to 5 active campaigns, 500 recipient imports per rolling 30-day window, a fixed 45-minute send interval, CSV personalization, and WYSIWYG HTML templates. Premium unlocks unlimited campaigns, unlimited recipients, custom intervals (e.g., send every 2 minutes), and removes promotional footers.

Ready to take control of your bulk email scheduling?

Connect your custom SMTP today and start scheduling personalized campaigns with automated pacing and complete domain privacy.

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