← All legal documents

Acceptable Use Policy

Last updated: June 8, 2026 Version: 1.0

This Acceptable Use Policy ("AUP") governs your use of the Senders Service and is incorporated into the Terms of Service. Capitalized terms have the meaning given in the Terms. A violation of this AUP is a material breach of the Terms and may result in suspension or termination, with or without notice. We may update this AUP as our Service and the legal landscape change.

Senders provides outbound email infrastructure and tooling. Because the Service sends email on your behalf and connects to your mailboxes, your conduct directly affects the security, reputation, and deliverability of shared infrastructure and other customers. These rules protect that shared environment and keep your sending lawful.

1. You are responsible for lawful sending

You may use the Service only to send business-to-business communications for which you have a lawful basis. You represent that, for every message you send through the Service, you have the rights, permissions, and lawful basis required by applicable law, and that you will comply with all laws governing your communications, including:

  • the CAN-SPAM Act (United States),
  • CASL (Canada),
  • the TCPA where applicable,
  • the GDPR and UK GDPR, and
  • applicable U.S. state privacy and marketing laws.

You are the controller of the recipient data you send to, including data you upload and data you source, access, or surface through the Service. You are responsible for establishing a lawful basis for contacting each recipient, for providing any notices required by law, and for honoring opt-out and objection requests. Senders does not provide notices to, or obtain consent from, your recipients on your behalf.

2. Required practices

When sending through the Service, you must:

  • send only to business contacts in a manner that relates to their profession, business, or employment;
  • include accurate header and "from" information that does not deceive or mislead recipients about the origin of the message;
  • include a functioning unsubscribe mechanism in every message and keep the Service's unsubscribe link intact;
  • promptly honor opt-out, unsubscribe, deletion, and objection requests, and not contact a recipient who has opted out;
  • maintain accurate sending domains and DNS authentication (SPF, DKIM, DMARC) for the domains you send from; and
  • use email verification and domain checks where the Service requires them or where your account policies require them.

3. Prohibited conduct

You will not, and will not permit any Authorized User or third party to:

Unlawful or deceptive sending

  • send spam, or send unsolicited communications in violation of any applicable law;
  • send messages with false, misleading, or forged headers, sender names, subject lines, or routing information;
  • send to recipients who have opted out, or harvest or scrape email addresses unlawfully;
  • impersonate any person or organization, or misrepresent your affiliation.

Harmful or prohibited content

  • transmit content that is unlawful, harassing, defamatory, hateful, or that infringes intellectual property or privacy rights;
  • promote or facilitate illegal goods or services, firearms where prohibited, adult content, fraud, phishing, or malware;
  • send messages designed to deceive recipients into disclosing credentials, payments, or sensitive information.

Data misuse

  • submit sensitive personal data to the Service (including health, financial-account, government-identifier, or special-category data) beyond the routine business contact information the Service is designed to process;
  • send recipient data to the Service that you lack the rights or lawful basis to process;
  • use the Service to build, sell, or distribute a competing contact database, or resell the Service's data or outputs in violation of the Terms.

System and security abuse

  • attempt to gain unauthorized access to the Service, other accounts, or our or our sub-processors' systems;
  • circumvent or attempt to circumvent sending limits, rate limits, credit limits, account policies, verification requirements, or other technical controls;
  • reverse engineer, decompile, or copy any part of the Service except to the extent permitted by law;
  • transmit malware, viruses, or other harmful code, or interfere with or disrupt the integrity or performance of the Service;
  • use bots, scrapers, or automated means to access the Service except through the interfaces and APIs we provide.

Reputation and infrastructure abuse

  • engage in sending patterns that materially harm the deliverability, reputation, or security of shared sending infrastructure or other customers;
  • operate multiple accounts to evade limits, suspensions, or these rules.

4. Account-level policies

Your account may be subject to additional, configurable policies set through the Service, which may include limits on the number of sequence steps, prospects per import, and active campaigns, and requirements such as mandatory email verification or domain checks before sending. These policies form part of this AUP for your account, and you must not attempt to circumvent them.

5. Enforcement

We may investigate suspected violations and may suspend, limit, or terminate access to mitigate risk to the Service, our infrastructure, our other customers, or any third party. Where practical we will provide notice, but we may act immediately where we reasonably believe a violation threatens security, deliverability, legal compliance, or the rights of others. We determine compliance with this AUP in our reasonable discretion.

To report suspected abuse of the Service, contact [email protected].

6. Contact

Kyuzo Corporation d/b/a Senders Abuse reports: [email protected] General: [email protected]