Permitted Use
Truncus supports two traffic types: transactional and outreach. Each type must use a separate sending domain.
Transactional email
Permitted transactional use cases include:
- Order confirmations and purchase receipts
- Password resets and account security notifications
- Account activity alerts and system notifications
- Invoices and billing confirmations
- Shipping and delivery notifications
- User-triggered workflow notifications (e.g., “your export is ready”)
Transactional emails must be sent to recipients who provided their email address directly to you and have an existing relationship with your service.
Outreach email (isolated streams)
Truncus supports personalized outreach via isolated streams. Outreach must meet all of the following conditions:
- Sent from a dedicated outreach domain, separate from your transactional domain
- Individually addressed and personalized — no bulk broadcasts
- Compliant with CAN-SPAM, GDPR, and applicable anti-spam laws
- Includes a working unsubscribe mechanism
- Uses the
x-truncus-traffic-type: outreach header
Outreach streams that exceed bounce or complaint thresholds (see Review Triggers below) will be automatically throttled or paused to protect your sending reputation.
Prohibited Use — Zero Tolerance
The following result in immediate account suspension without warning or refund:
- Spam or unsolicited bulk email of any kind
- Bulk unsolicited marketing, newsletters, or promotional broadcasts
- Purchased, rented, or scraped email lists
- Phishing, spoofing, or impersonation of any entity
- Malware, ransomware, or malicious content
- Email to harvested or guessed addresses
- Circumventing unsubscribe mechanisms
- Using Truncus to relay email on behalf of unlicensed third parties
- Content that is illegal under Dutch law, EU law, or the law of the recipient's jurisdiction
- Content that promotes violence, terrorism, hate, or child sexual abuse material
- Weapons, explosives, or controlled and illegal substances
These categories are also prohibited by the upstream providers that carry Truncus mail (Amazon SES, Scaleway TEM). Sending them puts the shared infrastructure — and every other Truncus customer — at risk, so there is no approval path for them.
Restricted Categories — Prior Approval Required
The following categories are not banned outright, but they carry structurally high complaint rates and elevated regulatory and reputational risk. Because Truncus sends over shared infrastructure, one such sender's complaints degrade deliverability for everyone. Sending from these categories requires our prior written approval. Accounts that send from them without approval may be held or suspended at our discretion:
- Gambling, betting, casinos, lotteries, sweepstakes, and related “game guide” content
- Adult or sexually explicit content, and dating services
- Cryptocurrency, digital-asset, token, and ICO promotion
- High-risk financial services: payday loans, debt relief, credit repair
- Prescription pharmaceuticals, supplements, and nutraceuticals
- Multi-level marketing, get-rich-quick, and work-from-home offers
- Affiliate marketing or programmatic-SEO content networks with no direct relationship to the recipient
To request approval, email info@truncus.co before you begin sending. Sending from a restricted category without approval may result in the account being held or suspended. Truncus is the sole arbiter of category classification and approval.
Review Triggers
The following patterns trigger automated review and may result in throttling or suspension:
- Spam complaint rate exceeding 2% in any 7-day window
- Bounce rate exceeding 10% in any 7-day window
- Volume spike exceeding 10× your normal daily baseline
- Sending to role addresses at scale (info@, admin@, support@, etc.)
- High rate of “user unknown” or “mailbox full” bounces
- Recipient-list patterns characteristic of purchased, rented, or scraped lists — for example alphabetically-iterated recipient sweeps or unusually broad recipient-domain fan-out from a new account. These patterns are detected automatically and, for new accounts, result in an immediate automated hold and account closure — a low bounce rate does not make a purchased list acceptable.
Automated systems act first. Human review follows. This order is intentional — reputational damage to shared infrastructure happens faster than any manual process can respond.
Your Responsibilities
- Maintain suppression lists: remove hard bounces immediately, soft bounces after 3 failures
- Honor unsubscribe requests within 10 business days
- Ensure you have a legal basis (consent or legitimate interest) to email each recipient
- Keep sending volume within your plan limits
- Secure your API keys — you are responsible for all activity under your account
- Comply with CAN-SPAM, GDPR, and all applicable email regulations in your jurisdiction
Enforcement
- Monitoring runs continuously. Threshold breaches trigger automated action.
- Suspension is applied first; review follows. This is not reversible for zero-tolerance violations.
- Appeals for non-zero-tolerance suspensions: email info@truncus.co within 14 days of suspension.
- Truncus is the sole arbiter of AUP violations. Our decision is final.
- For zero-tolerance violations we may, at our sole discretion, refund payments already made and permanently close the account. A refund is a courtesy, not an entitlement, and does not constitute an admission that the suspension was in error. Re-registration after a zero-tolerance closure is prohibited.
Why This Exists
Truncus uses shared sending infrastructure. When one sender spams, complaint rates rise across the entire platform, affecting the deliverability of every customer. These rules protect your deliverability as much as they protect ours. We enforce them without exception because there is no other way to maintain a platform that works reliably for legitimate senders.