Terms of Service

Effective Date: April 12, 2026

The following are the terms and conditions ("Terms") for use of the services provided by CELVIRO TECHNOLOGY LIMITED, a company incorporated in Hong Kong ("CELVIRO", "we", "us", or "our"), including the ZibPost email hosting platform, webmail client, management panels, and related services (collectively referred to as the "Services").

By accessing or using the Services, you agree to be bound by these Terms. If you do not agree, you must not use the Services. The Services are provided only to individuals who are at least 18 years old.

1. Definitions

Tenant — A natural person or legal entity that registers a customer account on the platform to manage enterprise email services, including custom domains, mailboxes, and end users.
End User — A natural person who uses a mailbox account created and managed by a Tenant.
Reseller — A person or entity authorized by CELVIRO to resell the Services and manage Tenant accounts on behalf of their clients.
Customer Data — All information, content, and data generated, transmitted, or stored by a Tenant or End User in connection with the Services, including emails, attachments, contacts, and calendar entries, but excluding CELVIRO's intellectual property.
Plan — A subscription tier that defines the features, storage limits, sending quotas, and other parameters available to a Tenant.

2. Account Registration and Security

You must provide accurate and complete information when registering for an account. You are responsible for maintaining the confidentiality of your login credentials and for all activities that occur under your account.

Tenants are jointly responsible for the activities of all End Users under their account. Resellers are responsible for ensuring that their managed Tenants comply with these Terms.

You must notify us immediately at [email protected] if you become aware of any unauthorized use of your account or any other security breach.

3. Custom Domain Requirements

Tenants who bind custom domains to the Services represent and warrant that they have the legal right to use such domains. Tenants are solely responsible for:

Configuring DNS records (MX, SPF, DKIM, DMARC) correctly;
Maintaining domain ownership and renewal;
Resolving any domain-related disputes with third parties.

CELVIRO is not liable for email delivery failures, loss of messages, or reputational damage caused by incorrect DNS configuration. We reserve the right to suspend services associated with any domain that is subject to a legal dispute or that we reasonably believe is being used in violation of these Terms.

4. Acceptable Use

You agree not to use the Services to:

Send unsolicited commercial email (spam), bulk email, or any duplicative or unsolicited messages;
Engage in email warming — artificially increasing sending volume or engagement to manipulate sender reputation, including through automated tools or third-party services;
Engage in deliverability testing — using automated systems or seed lists to test inbox placement across email providers with the intent of circumventing spam filters;
Send programmatically generated or automated transactional emails to external addresses (the Services are designed for business communication, not marketing automation);
Defame, abuse, harass, stalk, threaten, or otherwise violate the legal rights of others;
Distribute malware, viruses, trojan horses, or any harmful software;
Collect email addresses or personal information of others without their consent;
Impersonate any person or entity, or create fake identities;
Interfere with or disrupt the Services or servers connected to the Services;
Attempt to gain unauthorized access to other accounts or systems;
Violate any applicable laws or regulations.

We reserve the right to monitor usage for compliance with these Terms and to take action, including immediate account termination, if violations are detected.

5. Email Compliance Laws (CAN-SPAM / CASL)

Users who send emails through the Services must comply with all applicable anti-spam and email marketing laws, including but not limited to:

United States — CAN-SPAM Act

Commercial emails must include a valid physical postal address of the sender;
Commercial emails must include a clear and conspicuous unsubscribe mechanism;
Unsubscribe requests must be honored within 10 business days;
The "From", "To", and "Reply-To" fields must accurately identify the sender;
Subject lines must not be deceptive or misleading.

Canada — CASL (Canadian Anti-Spam Legislation)

Commercial electronic messages (CEMs) may only be sent to recipients who have given express or implied consent;
CEMs must include the sender's identity and contact information;
CEMs must include a functional unsubscribe mechanism;
Consent records must be maintained by the sender.

European Union — ePrivacy Directive

Direct marketing emails require prior opt-in consent from the recipient;
Each marketing email must include an easy opt-out option;
The sender's identity must not be disguised or concealed.

You are solely responsible for ensuring your use of the Services complies with the email laws of your jurisdiction and the jurisdictions of your recipients. CELVIRO reserves the right to suspend or terminate accounts that violate applicable email compliance laws, regardless of whether such use also violates other provisions of these Terms.

6. Sending Limits and Quotas

Each Plan includes defined daily sending limits and storage quotas. If you exceed your Plan's limits, the Services may throttle or temporarily suspend your outbound email delivery until the next quota reset period.

CELVIRO is not responsible for messages that fail to send due to quota exhaustion.

7. AI Services

The Services may include AI-powered features, including but not limited to:

AI Anti-Spam Filtering — Automated scanning of outbound emails to detect and block spam and policy-violating content. By using the Services, you consent to this automated processing.
AI Writing Assistant — AI-generated content suggestions for composing emails.

You acknowledge and agree that:

AI filtering may occasionally produce false positives (blocking legitimate emails) or false negatives (allowing unwanted emails). CELVIRO is not liable for any damages resulting from such errors;
You are solely responsible for reviewing and approving any content generated by the AI Writing Assistant before sending;
Email content processed by AI features is not used for AI model training, advertising, or profiling purposes.

8. Storage and Data Retention

Email messages and attachments are stored in Cloudflare R2 object storage. Storage capacity is limited by your Plan. When your storage quota is reached, you may be unable to receive new messages until storage is freed.

Email backup and archival services are not provided by default. Tenants are responsible for maintaining their own backups if required.

Upon account deletion, all Customer Data will be permanently removed within 30 days. During this period, data cannot be recovered once the deletion process begins.

9. Service Availability

We strive to maintain high availability of the Services but do not guarantee any specific uptime percentage or service level agreement (SLA). The Services are provided on an "as is" and "as available" basis.

We may perform scheduled maintenance with reasonable advance notice where practicable. We are not liable for any interruptions caused by maintenance, infrastructure failures, or circumstances beyond our control.

10. Pricing, Payment, and Taxes

All prices are listed in United States Dollars (USD) and are exclusive of applicable taxes. You are responsible for all taxes, duties, and levies imposed in your jurisdiction.

Payments are processed through third-party payment providers (Stripe and PayPal). By making a payment, you agree to the terms and conditions of the applicable payment provider.

11. Refund Policy

All fees paid for the Services are non-refundable. This includes, but is not limited to, subscription fees, plan upgrades, and any prepaid service periods. No refunds will be issued if you choose to discontinue using the Services, or if your access is terminated due to a violation of these Terms.

12. Intellectual Property

You retain all ownership rights in your Customer Data. CELVIRO does not claim any ownership of your emails, attachments, contacts, or other content stored through the Services.

You grant CELVIRO a limited, non-exclusive, worldwide license to process, transmit, store, and display your Customer Data solely for the purpose of providing the Services.

All software, interfaces, AI models, trademarks, and other intellectual property associated with the Services are owned by or licensed to CELVIRO. You may not copy, modify, reverse-engineer, or create derivative works of any part of the Services.

13. Reseller Accounts

You must not resell the Services unless you have been explicitly authorized as a Reseller by CELVIRO. If you are an authorized Reseller, you agree that:

Your clients retain all intellectual property rights in their Customer Data;
You must assist CELVIRO in enforcing these Terms against your clients upon request;
CELVIRO may, at a client's request, detach their account from your reseller management.

If you acquire the Services through a Reseller, you acknowledge that:

You accept these Terms in addition to any terms imposed by the Reseller;
CELVIRO is not responsible for the actions or omissions of the Reseller;
The Reseller has the ability to create, modify, delete, and access your accounts on your behalf.

14. Disclaimer of Warranties

To the maximum extent permitted by law, the Services are provided "as is" and "as available" without warranties of any kind, whether express or implied, including but not limited to warranties of merchantability, fitness for a particular purpose, and non-infringement.

CELVIRO does not warrant that:

The Services will be uninterrupted, error-free, or secure;
All emails will be delivered successfully;
Defects will be corrected in a timely manner;
The Services will be free of viruses or other harmful components.

15. Limitation of Liability

To the maximum extent permitted by law, CELVIRO shall not be liable for any indirect, incidental, special, consequential, or punitive damages, including but not limited to loss of data, loss of profits, loss of business, or loss of goodwill, arising out of or in connection with the use of or inability to use the Services.

In no event shall CELVIRO's total aggregate liability exceed the amount paid by you to CELVIRO in the twelve (12) months immediately preceding the event giving rise to the claim.

16. Indemnification

You agree to indemnify and hold harmless CELVIRO, its officers, directors, employees, and agents from any claims, damages, losses, or expenses (including reasonable legal fees) arising out of your use of the Services, your violation of these Terms, or your infringement of any third-party rights.

17. Termination and Suspension

CELVIRO may terminate or suspend your access to the Services immediately, without prior notice, if:

You violate these Terms;
Your account has an outstanding payment overdue;
Required by law or regulation;
Your use of the Services poses a risk to other users or to the platform's infrastructure.

Upon termination, your right to use the Services ceases immediately. Customer Data will be retained for 30 days after termination, after which it will be permanently deleted.

18. Force Majeure

CELVIRO shall not be liable for any failure or delay in performing its obligations under these Terms due to circumstances beyond its reasonable control, including but not limited to acts of God, natural disasters, war, terrorism, pandemic, strikes, government actions, Internet or infrastructure failures, or cyberattacks.

19. Changes to These Terms

We reserve the right to modify these Terms at any time. Updated Terms will be posted on this page with a revised effective date. Continued use of the Services after changes are posted constitutes your acceptance of the revised Terms.

20. Governing Law and Jurisdiction

These Terms shall be governed by and construed in accordance with the laws of Hong Kong, without regard to its conflict of law provisions. Any disputes arising out of or in connection with these Terms shall be submitted to the exclusive jurisdiction of the courts of Hong Kong.

21. General Provisions

If any provision of these Terms is found to be invalid or unenforceable, the remaining provisions shall remain in full force and effect.
These Terms constitute the entire agreement between you and CELVIRO with respect to the Services.
Our failure to enforce any right or provision of these Terms shall not be deemed a waiver of such right or provision.
CELVIRO may assign its rights and obligations under these Terms to any third party.
Headings in these Terms are for convenience only and have no legal significance.

Contact Us

If you have any questions about these Terms, please contact us at [email protected].