Terms of Service

1. These terms, and who they apply to

These terms cover your use of Plimsoll, A reply classifier that decides whether a domain's ramp continues, and a published daily ceiling the software enforces on the sending domains and mailboxes we operate.. They are a contract between Plimsoll, of 1204 E 6th St, Unit 3, Austin, TX 78702 (“Plimsoll”, “we”) and the company that signs up (“Customer”, “you”).

The service is for businesses only, not consumers. By signing up you confirm that you are acting for your business and that you have the authority to commit your company.

The person who accepts these terms accepts them for the company, not for themselves. If you don’t have that authority, please don’t go ahead.

If documents disagree. This order applies: (1) a signed order form or agreement between us, (2) the data processing agreement, (3) these terms, (4) our Privacy Policy, (5) anything else on our website.

2. What the service is

Infrastructure. The customer keeps their own sequencing tool, their own list and their own copy, and connects it to mailboxes we operate.

3. What the service is not

These limits are deliberate, and they are part of what you are buying. They are not defects.

Not a sequencer. Plimsoll does not write, schedule or personalise a campaign, and has no editor. It carries what your tool sends, up to the ceiling.

Not a list source. We do not sell, enrich or verify prospect data, and we will not import a list.

Not unlimited. There is no plan, price or negotiation that raises a domain above its published ceiling. The ceiling is the product.

4. What you need to do, and why it matters

What you get from the service depends a lot on things only you control. Please read this section carefully, because sections 9 and 10 build on it.

Consent and compliance. The customer is responsible for having a lawful basis to contact each recipient, and for CAN-SPAM, GDPR and every equivalent that applies to them.

Their own content. Copy, subject lines and offers are the customer's. We do not review them and we do not approve them.

Honouring the ramp. A domain held flat by an unreviewed reply stays flat. Routing around it with a domain bought elsewhere is a breach of these terms.

Accurate sender identity. The customer warrants that the sending identity on each domain is a real entity that can be replied to and can be complained about.

5. Getting started, and what is free

The first domain runs free for its full 21-day ramp, including DNS and authentication setup and the reply history backfill.

Billing starts on the first day that domain reaches its published ceiling, not on the day it is provisioned.

6. Fees

$90 per domain per month. Published, flat, and identical at one domain or forty. There are no volume tiers and no annual discount.

What is not charged. Mailboxes, DNS setup, the reply backfill, reviewer time on held replies, and any day a domain spends below its ceiling.

Term. Month to month. A canceled domain keeps sending to the end of the paid month and its suppression list is exported on request.

7. Delivery, availability and support

SMTP and IMAP. Mailboxes are reachable by the customer's own sequencing tool on standard credentials. Nothing has to run inside our interface.

The ceiling report. Each domain's ceiling, current ramp position, complaint rate and held-reply count are available daily by API and by export.

Support. Support is by email at [email protected]. We aim to reply within one business day. That is a target, not a guarantee.

8. The send record, and why the suppression list outlives it

Every send is attributable. Domain, mailbox, recipient, timestamp, delivery result and the reply classification if one came back.

Suppressions do not expire. An address that asked to be removed stays suppressed across every domain, after cancellation, and after the customer's account is closed.

9. What we promise, and what we don’t

We promise to provide the service with reasonable skill and care, and that we have the right to provide it.

Plimsoll does not warrant inbox placement, reply rates or campaign outcomes. It warrants that a domain never exceeds its published ceiling and that every reply is classified or held.

Beyond that we give no other warranty. As far as the law allows, we exclude all implied warranties, including merchantability, fitness for a particular purpose and non-infringement.

10. Liability

10.1 Neither of us limits liability for death or personal injury caused by negligence, for fraud or fraudulent misrepresentation, or for anything else the law says can’t be limited.

10.2 Losses neither of us covers. Neither of us is liable for lost profit, revenue, expected savings, business, goodwill or reputation, or for any indirect or consequential loss, however it arises.

10.3 Specific exclusions. Plimsoll is not liable for campaign performance, for a recipient's complaint, or for a mailbox provider's independent decision about a customer's content.

10.4 Cap. Aggregate liability is capped at the fees paid for the affected domains in the twelve months before the claim.

10.5 You accept that the limits in sections 9 and 10 are a fair way to share risk, given the price and your part under section 4, and that we could not offer the service at this price without them.

11. Confidentiality and data

Reply content and send metadata are the customer's confidential information. Until Q1 2027 free-text replies are classified by Azure OpenAI in West US 3 under zero data retention, and from then by Plimsoll's own classifier on GPU instances in Oregon. Plimsoll reviewers read a reply only when its classification falls below the confidence floor, and each read is logged.

How we handle personal data is set out in our Privacy Policy and in the data processing agreement between us, which forms part of these terms. If the DPA and these terms disagree about personal data, the DPA wins.

12. Who owns what

The customer owns their list, their copy and their sending identity. Plimsoll owns the ramp model, the classifier and the labeled reply corpus, which is held detached from customer and recipient identifiers.

You may not use our name or logo in public, and we may not use yours, without written permission first.

13. How long this lasts, and how it ends

13.1 The contract starts when you sign up and runs until one of us ends it.

13.2 You can end it. Cancel at any time. It takes effect at the end of the current billing month, unless section 6 sets a minimum term.

13.3 We can end it. We can end it with 30 days’ notice. We can end it immediately if you seriously break these terms and don’t fix it within 14 days of being told, if you become insolvent, or if your use exposes us to legal risk.

13.4 What happens then. We stop delivering and stop billing. You keep everything already delivered to you, and your right to use it continues. We delete or return our working copies as the DPA says. Sections 9, 10, 11 and 12 continue to apply.

14. Changes to these terms

We may update these terms. A change that matters takes effect 30 days after we email you about it. If you don’t accept it, you can end the contract before then. Using the service after that date means you accept the change.

15. Contact

Plimsoll, 1204 E 6th St, Unit 3, Austin, TX 78702
[email protected]

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