Thunderbird Thunderbird Pro

Terms

Thunderbird Pro Services Terms of Service

Thank you for using Thunderbird Pro Services! These Terms of Service are a legal agreement between you and MZLA Technologies Corporation (“MZLA”) governing your use of our Services. By creating an account or using the Services, you agree to be bound by these Terms.

Effective date: Februrary 10, 2026

1. Definitions

  1. An “Account” represents your legal relationship with MZLA and your authorization to log in to and use our Services. Your Account also serves as your identity on the Services.
  2. The “Agreement” refers, collectively, to all the terms, conditions, notices contained or referenced in this document (the “Terms of Service” or the “Terms”) and all other operating rules, policies (including the Thunderbird Pro Privacy Statement) and procedures that we may publish from time to time on the Website.
  3. “Beta Previews” mean software, services, or features identified as alpha, beta, preview, early access, or evaluation, or words or phrases with similar meanings.
  4. “Content” refers to content featured or displayed through the Services, including without limitation code, text, data, articles, images, photographs, graphics, software, applications, packages, designs, features, and other materials that are available through the Services. “Content” also includes the Services. “User-Generated Content” is Content, written or otherwise, created or uploaded by our Users. “Your Content” is Content that you create or own.
  5. “MZLA,” “We,” and “Us” refer to MZLA Technologies Corporation, as well as our affiliates Mozilla Foundation and Mozilla Corporation, and our directors, subsidiaries, contractors, licensors, officers, agents, and employees.
  6. The “Services” refers to the online services provided by MZLA, including Thundermail, Send, Appointment, any Beta Previews.
  7. “The User,” “You,” and “Your” refer to the individual person, company, or organization that has visited or is using the Website or Service; that accesses or uses any part of the Account; or that directs the use of the Account in the performance of its functions. A User must be at least 13 years of age.
  8. The “Website” refers to the Thunderbird website located at thunderbird.net and tb.pro, and all content, services, and products provided by MZLA at or through the Website. It also refers to any other MZLA-owned domains and subdomains. Occasionally, websites owned by MZLA may provide different or additional terms of service. If those additional terms conflict with this Agreement, the more specific terms apply to the relevant page or service.

2. Account Terms

a. Account Controls

Subject to these Terms, you retain ultimate administrative control over your Account and the Content within it.

b. Required Information

You must provide a valid email address in order to complete the Account registration process. Additional information, including your full name, will be necessary for billing purposes.

c. Account Requirements

The following rules apply to Accounts on Thunderbird Pro Services:

  • You must be a human to create an Account. Accounts registered by “bots” or other automated methods are not permitted.
  • You must be at least 13 years old to create an Account, due to limitations of US law. If we learn of any User under the age of 13, we will terminate that User’s Account immediately. If you are a resident of a country outside the United States, your country’s minimum age may be older; in such a case, you are responsible for complying with your country’s laws.
  • You may not use the Services in violation of export control or sanctions laws of the United States or any other applicable jurisdiction. You may not use the Services if you are or are working on behalf of a Specially Designated National (SDN) or a person subject to similar blocking or denied party prohibitions administered by a U.S. government agency. MZLA may allow persons in certain sanctioned countries or territories to access certain Services pursuant to U.S. government authorizations.

d. Account Security

You are responsible for keeping your Account secure while you use our Service. We offer tools such as two-factor authentication to help you maintain your Account’s security, but the content of your Account and its security are up to you. In addition:

  • You are responsible for all content posted and activity that occurs under your Account (even when content is posted by others who gain access to your Account).
  • You are responsible for maintaining the security of your Account and password. MZLA will not be liable for any loss or damage from your failure to comply with this security obligation.
  • You will promptly notify MZLA by contacting us at [email protected] if you become aware of any unauthorized use of, or access to, our Services through your Account, including any unauthorized use of your password or Account.

e. Additional Terms

In some situations, third parties' terms may apply to your use of the Services. For example, you may download an application that integrates with the Service. Please be aware that while these Terms are our full agreement with you, other parties' terms govern their relationships with you.

3. Acceptable Use

Your use of the Website and Services must not violate any applicable laws, including copyright or trademark laws, export control or sanctions laws, or other laws in your jurisdiction. You are responsible for making sure that your use of the Services is in compliance with laws and any applicable regulations.

In order to ensure a high quality of service to all our users, we may at our discretion impose bandwidth- or rate-limits on your use of the services.The following conduct is prohibited on the Services:

  • Illegal activities, including the promotion or solicitation of illegal acts.
  • Malicious activity or content, such as the transmission of viruses, malware, or any other malicious or destructive code, or activity intended to harm or disrupt the hardware, networks, or infrastructure of MZLA or any third parties.
  • Unauthorized Access, including accessing or attempting to access any non-public interface, system, or functionality of the Services, or testing the Services for vulnerabilities.
  • Abuse, including threats of violence or harassment of a user through repeated unwanted contact.
  • Automated use of the Services, including for bulk or high-volume delivery of email or files.
  • Automated access to or crawling/scraping of the Services via bots, spiders, crawlers, or any other automated means.
  • Posting anyone’s personal or confidential information, such as social security numbers, credit card numbers, street addresses, phone numbers, confidential ID numbers, or account passwords, without their permission.
  • Account hijacking, including any access to or use of another user’s account without their permission.
  • Child exploitation, including uploading or sharing any content exploits or abuses children.
  • Spam, including posting unsolicited promotional or commercial content in comments, sending invitations for the purpose of advertising to the recipients, or posting content or links for the purpose of manipulating search or other algorithms.
  • Intellectual property infringement, including the infringing use of third party trademarks or the unauthorized and unlawful posting of copyrighted content. We respond to reports of copyright infringement as described in our Copyright Policy.
  • Fraud or impersonation, including any use of the Services to impersonate or deceive others (but excluding parody).

4. User-Generated Content

a. Responsibility for User-Generated Content

You may create or upload User-Generated Content while using the Services. You are solely responsible for the content of, and for any harm resulting from, any User-Generated Content that you post, upload, link to or otherwise make available via the Services, regardless of the form of that Content. We are not responsible for any public display or misuse of your User-Generated Content.

b. MZLA May Remove Content

We have the right to refuse or remove any User-Generated Content that, in our sole discretion, violates any laws or any of our terms or policies.

c. Ownership of Content, Right to Post, and License Grants

You retain ownership of and responsibility for Your Content. If you share anything you did not create yourself or do not own the rights to, you agree that you are responsible for any Content you share; that you will only submit Content that you have the right to share; and that you will fully comply with any third party licenses relating to Content you share.

Because you retain ownership of and responsibility for Your Content, we need you to grant us — and other Users of the Services — certain legal permissions, listed in Sections 4(d) - 4(f) below. These license grants apply to Your Content. If you upload Content that already comes with a license granting us the permissions we need to run our Service, no additional license is required. You understand that you will not receive any payment for any of the rights granted in Sections 4(d) - 4(f).

When you remove Your Content from our servers, we will continue to have a license so long as we have the right to retain Your Content as provided in Section 9(b) (“Upon Cancellation”), and only to the extent necessary to exercise our rights under that section. After that, the Content licenses you grant in this Section will end with respect to Content associated with your account. If you have shared Your Content with other users, then the licenses in this section shall persist so long as the Content resides on the Services.

d. Our License to Your Content

We need the legal right to do things like host Your Content and share it as directed by you, for example when you attach it to an email message or share it via Send. You grant us and our legal successors the right to store, distribute, archive, parse, and display Your Content, and make incidental copies, as necessary to provide the Services, including improving the Services over time. This license includes the right to do things like copy Your Content to our database and make backups; display it to you and other users you share it with; parse it into a search index or otherwise analyze it on our servers; and share it with other users at your direction.

This license does not grant MZLA the right to sell Your Content. It also does not grant MZLA the right to otherwise distribute or use Your Content outside of our provision of the Service.

e. Moral Rights

You retain all moral rights to Your Content that you upload, share, or submit to any part of the Services, including the rights of integrity and attribution. However, you waive these rights and agree not to assert them against us, to enable us to reasonably exercise the rights granted in Section 4(d), but not otherwise.

To the extent this agreement is not enforceable by applicable law, you grant MZLA the rights we need to use Your Content without attribution and to make reasonable adaptations of Your Content as necessary to render the Website and provide the Services.

f. Feedback

We’re always trying to improve our products and Services, and your feedback will help us do that. If you choose to give us any ideas, know-how, algorithms, code contributions, suggestions, enhancement requests, recommendations or any other feedback for our products or Services (collectively, “Feedback”), you acknowledge and agree that MZLA will have a royalty-free, fully paid-up, worldwide, transferable, sub-licensable, irrevocable and perpetual license to implement, use, modify, commercially exploit and/or incorporate the Feedback into our products, services, and documentation.

You represent that your feedback is your original creation. If your feedback includes any third-party materials, you agree to include complete details of any third-party license or other restriction (including, but not limited to, related patents and trademarks) of which you are personally aware and which are associated with any part of your feedback.

6. Copyright Infringement and DMCA Policy

If you believe that content on our website or Services violates your copyright or trademark, please contact us to report the issue in accordance with the information on this page. There may be legal consequences for sending a false or frivolous takedown notice. Before sending a takedown request, you must consider legal uses such as fair use and licensed uses.

We will terminate the Accounts of Users who repeatedly use the Services to infringe copyright.

7. Intellectual Property Notice

a. Our Rights to Our Content

MZLA and our licensors, vendors, agents, and/or our content providers retain ownership of all intellectual property rights of any kind related to the Website and Services (with the exception of any User Content hosted on the Services). We reserve all rights that are not expressly granted to you under this Agreement or by law.

b. Thunderbird Trademarks and Logos

If you’d like to use Thunderbird’s trademarks, you must follow the Mozilla Trademark Guidelines.

c. License to These Terms

This Agreement is based on the GitHub Terms of Service, and like those terms, is licensed under this Creative Commons Zero license.

7. Earlybird Access

Earlybird Access (limited pre-launch access to the Services) may not be supported and may be changed at any time without notice. In addition, pre-launch Services are not subject to the same security measures and auditing to which the Service has been and is subject. By using a Service during the Earlybird Access period, you use it at your own risk.

8. Payment

a. Pricing

Our pricing is available on our Website. If you agree to a subscription price, that will remain your price for the duration of the payment term; however, prices are subject to change at the end of a payment term.

b. Billing Schedule; No Refunds

The Service is billed in advance at the beginning of the billing period. You may cancel your subscription for a full refund within 14 days of your initial registration. After this 14-day refund period, there will be no refunds or credits for partial months of service, downgrade refunds, or refunds for months unused with an open Account. However, the service will remain active for the length of the paid billing period unless it is otherwise terminated according to these Terms.

c. Authorization

By agreeing to these Terms, you are giving us permission to direct our payment processor to charge your on-file credit card, PayPal account, or other approved methods of payment for fees that you authorize for the Services.

d. Responsibility for Payment

You are responsible for all fees, including taxes, associated with your use of the Service. By using the Service, you agree to pay MZLA any charge incurred in connection with your use of the Service. If you dispute the matter, contact support. You are responsible for providing us with a valid means of payment for paid Accounts.

9. Cancellation and Termination

a. Account Cancellation

It is your responsibility to cancel your Account when you no longer wish to use or be charged for the Services. You can cancel your Account at any time by visiting your accounts dashboard on accounts.tb.pro.

b. Upon Cancellation

We will retain and use your information as necessary to comply with our legal obligations, resolve disputes, and enforce our agreements. On termination of your access to the Services for any reason, we shall have no obligation to maintain any User data or Content in your Account or to provide any data or Content to you or any third party unless required by applicable law.

c. Our Right to Terminate

MZLA has the right to suspend or terminate your access to all or any part of the Website or Services at any time, with or without notice, effective immediately, if we determine in our sole discretion that (1) you have violated these Terms, any other MZLA policy, or applicable law, or (2) that your continued use of the services poses a risk to MZLA or its users. MZLA reserves the right to refuse service to anyone for any reason at any time.

d. Survival

All provisions of this Agreement which, by their nature, should survive termination will survive termination — including, without limitation: ownership provisions, warranty disclaimers, indemnity, and limitations of liability.

10. Communications with MZLA

a. Electronic Communication Required

For purposes of communicating with you about your Account, you (1) consent to receive communications from us in an electronic form via the email address you have submitted or via the Service; and (2) agree that all Terms of Service, agreements, notices, disclosures, and other communications that we provide to you electronically satisfy any legal requirement that those communications would satisfy if they were on paper. This section does not affect your non-waivable rights.

b. Legal Notice to MZLA Must Be in Writing

Communications made through email or MZLA’s support messaging system will not constitute legal notice to MZLA or any of its officers, employees, agents or representatives in any situation where notice to MZLA is required by contract or any law or regulation. Legal notice to MZLA must be in writing to [email protected].

c. Contacting Support

You can request support by submitting a request at https://support.tb.pro.

MZLA only offers support via email, in-Service communications, and electronic messages. We do not offer telephone support.

11. Disclaimer of Warranties

We are committed to providing an excellent product and work hard to resolve technical issues when we learn about them. However, we provide no guarantees regarding the Website or Services. MZLA provides the Website and the Services “as is” and “as available,” without warranty of any kind. Without limiting this, we expressly disclaim all warranties, whether express, implied or statutory, regarding the Website and the Services including without limitation any warranty of merchantability, fitness for a particular purpose, title, security, accuracy and non-infringement.

MZLA does not warrant that the Services will meet your requirements; that the Services will be uninterrupted, timely, secure, or error-free; that the information provided through the Services is accurate, reliable or correct; that any defects or errors will be corrected; that the Services will be available at any particular time or location; or that the Services are free of viruses or other harmful components. You assume full responsibility and risk of loss resulting from your downloading and/or use of files, information, content or other material obtained from the Services.

12. Limitation of Liability

You understand and agree that we will not be liable to you or any third party for any loss of profits, use, goodwill, or data, or for any incidental, indirect, special, consequential or exemplary damages, however arising, that result from:

  • the use, disclosure, or display of your User-Generated Content;
  • your use or inability to use the Services;
  • any modification, price change, suspension or discontinuance of the Services;
  • the Services generally or the software or systems that make the Services available;
  • unauthorized access to or alterations of your transmissions or data;
  • statements or conduct of any third party on the Services;
  • any other user interactions that you input or receive through your use of the Services; or
  • any other matter relating to the Services.

Our liability is limited whether or not we have been informed of the possibility of such damages, and even if a remedy set forth in this Agreement is found to have failed of its essential purpose. We will have no liability for any failure or delay due to matters beyond our reasonable control.

13. Release and Indemnification

If you have a dispute with any third party regarding your (or their) use of the Services, you agree to release MZLA from any and all claims, demands and damages (actual and consequential) of every kind and nature, known and unknown, arising out of or in any way connected with such disputes.

You agree to indemnify us, defend us, and hold us harmless from and against any and all claims, liabilities, and expenses, including attorneys’ fees, arising out of your use of the Website and the Services, including but not limited to your violation of this Agreement, provided that MZLA (1) promptly gives you written notice of the claim, demand, suit or proceeding; (2) gives you sole control of the defense and settlement of the claim, demand, suit or proceeding (provided that you may not settle any claim, demand, suit or proceeding unless the settlement unconditionally releases MZLA of all liability); and (3) provides to you all reasonable assistance, at your expense.

14. Changes to These Terms

We reserve the right, at our sole discretion, to amend these Terms of Service at any time and will update these Terms of Service in the event of any such amendments. We will notify our Users of material changes to this Agreement, such as price increases, at least 30 days prior to the change taking effect by posting a notice on our Website or sending email to the primary email address specified in your Account. Customer’s continued use of the Services after those 30 days constitutes agreement to those revisions of this Agreement. For any other modifications, your continued use of the Website constitutes agreement to our revisions of these Terms of Service.

We reserve the right at any time and from time to time to modify or discontinue, temporarily or permanently, the Website (or any part of it) or Services with or without notice.

15. Miscellaneous

a. Governing Law

Except to the extent applicable law provides otherwise, this Agreement between you and MZLA and any access to or use of the Website or the Services are governed by the federal laws of the United States of America and the laws of the State of California, without regard to conflict of law provisions. You and MZLA agree to submit to the exclusive jurisdiction and venue of the courts located in the City and County of San Francisco, California.

b. Non-Assignability

MZLA may assign or delegate these Terms of Service and/or our Privacy Statement, in whole or in part, in the event of a merger or acquisition of MZLA. You may not assign or delegate any rights or obligations under the Terms of Service or Privacy Statement without our prior written consent, and any unauthorized assignment and delegation by you is void.

c. Section Headings and Summaries

Throughout this Agreement, each section includes titles of the following terms and conditions. These section titles are not legally binding.

d. Severability, No Waiver, and Survival

If any part of this Agreement is held invalid or unenforceable, that portion of the Agreement will be construed to reflect the parties’ original intent. The remaining portions will remain in full force and effect. Any failure on the part of MZLA to enforce any provision of this Agreement will not be considered a waiver of our right to enforce such provision. Our rights under this Agreement will survive any termination of this Agreement.

e. Amendments; Complete Agreement

This Agreement may only be modified by a written amendment signed by an authorized representative of MZLA, or by the posting by MZLA of a revised version in accordance with Section 14 (“Changes to These Terms”). These Terms of Service, together with the Privacy Statement, represent the complete and exclusive statement of the agreement between you and us. This Agreement supersedes any proposal or prior agreement oral or written, and any other communications between you and MZLA relating to the subject matter of these terms including any confidentiality or nondisclosure agreements.

f. Questions

Questions about the Terms of Service? Contact us at https://support.tb.pro/ .