Privacy Policy

Maintaining your privacy is really, really important to us. This Privacy Policy describes how Mailosaur collects, uses and discloses information, and what choices you have with respect to that information.

When we refer to “Mailosaur”, we mean Mailosaur Ltd, a company registered in England & Wales (#07999725) whose registered address is Sg House, 6 St Cross Road, Winchester, Hampshire SO23 9HX, United Kingdom.

Mailosaur acts as the controller or processor of your information, as explained in more detail in the “Identifying the Data Controller and Processor” section below.

Table of Contents

  • Applicability of this Privacy Policy
  • Information We Collect and Receive
  • How We Use Information
  • Data Retention
  • How We Share and Disclose Information
  • Security
  • Age Limitations
  • Changes to this Privacy Policy
  • International Data Transfers: Privacy Shield and Contractual Terms
  • Data Protection Officer
  • Identifying the Data Controller and Processor
  • Your Rights
  • Data Protection Authority
  • Contacting Mailosaur

Applicability Of This Privacy Policy

This Privacy Policy applies to Mailosaur’s online software, testing tools and platform, including the associated Mailosaur mobile and desktop applications (collectively, the “Services”), and other Mailosaur websites (collectively, the “Websites”) and other interactions (e.g., customer service inquiries, webinars, user conferences, etc.) you may have with Mailosaur. If you do not agree with the terms, do not access or use the Services, Websites or any other aspect of Mailosaur’s business.

The Policy forms part of the overall agreement that governs delivery, access and use of the Services (the “Terms of Service”), including the processing of any messages, files or other content submitted through Services accounts (collectively, “Customer Data”). The organization (e.g., your employer or another entity or person) that entered into the Terms of Service (“Customer”) controls their instance of the Services (their “Account”) and any associated Customer Data. If you have any questions about specific Account settings and privacy practices, please contact the Customer whose Account you use.

This Privacy Policy does not apply to any third party applications or software that integrate with the Services through the Mailosaur platform (“Third Party Services”), or any other third party products, services or businesses.

Information We Collect And Receive

Mailosaur may collect and receive Customer Data and other information and data (“Other Information”) in a variety of ways:

  • Customer Data. Customers or individuals granted access to an Account by a Customer (“Authorized Users”) routinely submit Customer Data to Mailosaur when using the Services (e.g., electronic mail and SMS content for testing).
  • Other Information. Mailosaur also collects, generates and/or receives Other Information:

    1. Account Information. To create or update an Account, you or your Customer (e.g., your employer) supply Mailosaur with an email address, password, and/or similar account details. In addition, Customers that purchase a paid version of the Services provide Mailosaur (or its payment processors) with billing details such as credit card information, banking information and/or a billing address.
    2. Usage Information.

      • Services Metadata. When an Authorized User interacts with the Services, metadata is generated that provides additional context about the way Authorized Users work. For example, Mailosaur logs the Accounts, servers, users, features, content and links you interact with.
      • Log data. As with most websites and technology services delivered over the Internet, our servers automatically collect information when you access or use our Websites or Services and record it in log files. This log data may include the Internet Protocol (IP) address, the address of the web page visited before using the Website or Services, browser type and settings, the date and time the Services were used, information about browser configuration and plugins, language preferences and cookie data.
      • Device information. Mailosaur collects information about devices accessing the Services, including type of device, what operating system is used, device settings, application IDs, unique device identifiers and crash data. Whether we collect some or all of this Other Information often depends on the type of device used and its settings.
      • Location information. We receive information from you, your Customer and other third-parties that helps us approximate your location. We may, for example, use a business address submitted by your employer, or an IP address received from your browser or device to determine approximate location. Mailosaur may also collect location information from devices in accordance with the consent process provided by your device.
    3. Cookie Information. Mailosaur uses cookies and similar technologies in our Websites and Services that help us collect Other Information. The Websites and Services may also include cookies and similar tracking technologies of third parties, which may collect Other Information about you via the Websites and Services and across other websites and online services. For more details about how we use these technologies, please see our Cookie Policy.
    4. Third Party Services. Customer may choose to permit or restrict Third Party Services for their Account. Typically, Third Party Services are software that integrate with our Services, and a Customer can permit its Authorized Users to enable and disable these integrations for their Account. Once enabled, the provider of a Third Party Service may share certain information with Mailosaur. For example, if a Customer chooses to use Google authentication to register for our Services, we may receive user name and email address of Authorized Users, along with additional information that the application has elected to make available to Mailosaur to facilitate the integration. Authorized Users should check the privacy settings and notices in these Third Party Services to understand what data may be disclosed to Mailosaur. When a Third Party Service is enabled, Mailosaur is authorized to connect and access Other Information made available to Mailosaur in accordance with our agreement with the Third Party Provider. We do not, however, receive or store passwords for any of these Third Party Services when connecting them to the Services.
    5. Additional Information Provided to Mailosaur. We receive Other Information when submitted to our Websites or if you participate in a survey, contest, activity or event, apply for a job, request support, interact with our social media accounts or otherwise communicate with Mailosaur.

Generally, no one is under a statutory or contractual obligation to provide any Customer Data or Other Information (collectively, “Information”). However, certain Information is collected automatically and, if some Information, such as Account setup details, is not provided, we may be unable to provide the Services.

How We Use Information

Customer Data will be used by Mailosaur in accordance with Customer instructions, including any applicable terms in the Terms of Service and the Customer’s use of Services functionality, and as required by applicable law. Mailosaur is a processor of Customer Data and the Customer is the controller. Customer may, for example, use the Services to grant and remove access to an Account, assign roles and configure settings, access, modify, export, share and remove Customer Data and otherwise apply its policies to the Services.

Mailosaur uses Other Information as part of our legitimate interests in operating our Services, Websites and business. More specifically, Mailosaur uses Other Information:

  • To provide, update, maintain and protect our Services, Websites and business. This includes use of Other Information to support delivery of the Services under a Terms of Service, prevent or address service errors, security or technical issues, analyze and monitor usage, trends and other activities or at an Authorized User’s request.
  • As required by applicable law, legal process or regulation.
  • To communicate with you by responding to your requests, comments and questions. If you contact us, we may use your Other Information to respond.
  • To develop and provide tools and additional features. Mailosaur tries to make the Services as useful as possible for specific Accounts and Authorized Users. For example, we may make Services suggestions based on historical use and predictive models, identify organizational trends and insights, to customize a Services experience or create new features and products.
  • To send emails and other communications. We may send you service, technical and other administrative emails, messages and other types of communications. We may also contact you to inform you about changes in our Services, our Services offerings, and important Services-related notices, such as security and fraud notices. These communications are considered part of the Services and you may not opt out of them. In addition, we sometimes send emails about new product features, promotional communications or other news about Mailosaur. These are marketing messages so you can control whether you receive them.
  • For billing, account management and other administrative matters. Mailosaur may need to contact you for invoicing, account management and similar reasons and we use account data to administer accounts and keep track of billing and payments.
  • To investigate and help prevent security issues and abuse.

If Information is aggregated or de-identified so it is no longer reasonably associated with an identified or identifiable natural person, Mailosaur may use it for any business purpose. To the extent Information is associated with an identified or identifiable natural person and is protected as personal data under applicable data protection law, it is referred to in this Privacy Policy as “Personal Data.”

Data Retention

Mailosaur will retain Customer Data in accordance with a Customer’s instructions, including any applicable terms in the Terms of Service and Customer’s use of Services functionality, and as required by applicable law. Customer may be able to customise its retention settings and apply those customised settings at server level or other level. The deletion of Customer Data and other use of the Services by Customer may result in the deletion and/or de-identification of certain associated Other Information. For more detail, please contact Mailosaur may retain Other Information pertaining to you for as long as necessary for the purposes described in this Privacy Policy. This may include keeping your Other Information after you have deactivated your account for the period of time needed for Mailosaur to pursue legitimate business interests, conduct audits, comply with (and demonstrate compliance with) legal obligations, resolve disputes and enforce our agreements.

How We Share And Disclose Information

This section describes how Mailosaur may share and disclose Information. Customers determine their own policies and practices for the sharing and disclosure of Information, and Mailosaur does not control how they or any other third parties choose to share or disclose Information.

  • Customer’s Instructions. Mailosaur will solely share and disclose Customer Data in accordance with a Customer’s instructions, including any applicable terms in the Terms of Service and Customer’s use of Services functionality, and in compliance with applicable law and legal process.
  • Displaying the Services. When an Authorized User submits Other Information, it may be displayed to other Authorized Users in the same or connected Accounts. For example, an Authorized User’s email address may be displayed with their Account profile.
  • Customer Access. Owners, administrators, Authorized Users and other Customer representatives and personnel may be able to access, modify or restrict access to Other Information. This may include, for example, your employer using Service features to export logs of Account activity, or accessing or modifying your profile details.
  • Third Party Service Providers and Partners. We may engage third party companies or individuals as service providers or business partners to process Other Information and support our business. These third parties may, for example, provide virtual computing and storage services. Additional information about the subprocessors we use to support delivery of our Services is set forth at Mailosaur Subprocessors.
  • Corporate Affiliates. Mailosaur may share Other Information with its corporate affiliates, parents and/or subsidiaries.
  • During a Change to Mailosaur’s Business. If Mailosaur engages in a merger, acquisition, bankruptcy, dissolution, reorganization, sale of some or all of Mailosaur’s assets or stock, financing, public offering of securities, acquisition of all or a portion of our business, a similar transaction or proceeding, or steps in contemplation of such activities (e.g. due diligence), some or all Other Information may be shared or transferred, subject to standard confidentiality arrangements.
  • Aggregated or De-identified Data. We may disclose or use aggregated or de-identified Other Information for any purpose. For example, we may share aggregated or de-identified Other Information with prospects or partners for business or research purposes, such as telling a prospective Mailosaur customer the average amount of time spent within a typical Account.
  • To Comply with Laws. If we receive a request for information, we may disclose Other Information if we reasonably believe disclosure is in accordance with or required by any applicable law, regulation or legal process. Please see the Data Request Policy to understand how Mailosaur responds to requests to disclose data from government agencies and other sources.
  • To enforce our rights, prevent fraud, and for safety. To protect and defend the rights, property or safety of Mailosaur or third parties, including enforcing contracts or policies, or in connection with investigating and preventing fraud or security issues. With Consent, Mailosaur may share Other Information with third parties when we have consent to do so.


Mailosaur takes security of data very seriously. Mailosaur works hard to protect Other Information you provide from loss, misuse, and unauthorized access or disclosure. These steps take into account the sensitivity of the Other Information we collect, process and store, and the current state of technology. To learn more about current practices and policies regarding security and confidentiality of the Services, please see our Security Practices. Given the nature of communications and information processing technology, Mailosaur cannot guarantee that Information, during transmission through the Internet or while stored on our systems or otherwise in our care, will be absolutely safe from intrusion by others.

Age Limitations

To the extent prohibited by applicable law, Mailosaur does not allow use of our Services and Websites by anyone younger than 16 years old. If you learn that anyone younger than 16 has unlawfully provided us with personal data, please contact us and we will takes steps to delete such information.

Changes To This Privacy Policy

Mailosaur may change this Privacy Policy from time to time. Laws, regulations and industry standards evolve, which may make those changes necessary, or we may make changes to our business. We will post the changes to this page and encourage you to review our Privacy Policy to stay informed. If we make changes that materially alter your privacy rights, Mailosaur will provide additional notice, such as via email or through the Services. If you disagree with the changes to this Privacy Policy, you should deactivate your Services account. Contact the Customer if you wish to request the removal of Personal Data under their control.

International Data Transfers Privacy Shield And Contractual Terms

Mailosaur may transfer your Personal Data to countries other than the one in which you live. In order to ensure adequate protection for your data, we will only ever use partners and suppliers who maintain data within the European Union or Switzerland, or comply with either the E.U.-U.S. Privacy Shield and Swiss-U.S. Privacy Shield or European Union Model Clauses.

Data Protection Officer

To communicate with our Data Protection Officer, please email

Identifying The Data Controller And Processor

Data protection law in certain jurisdictions differentiates between the “controller” and “processor” of information. In general, Customer is the controller of Customer Data. In general, Mailosaur is the processor of Customer Data and the controller of Other Information. Mailosaur Ltd, is a company registered in England & Wales (#07999725) and is the controller of Other Information and a processor of Customer Data relating to Authorized Users who use Accounts established for Customers.

Your Rights

Individuals located in certain countries, including the European Economic Area, have certain statutory rights in relation to their personal data. Subject to any exemptions provided by law, you may have the right to request access to Information, as well as to seek to update, delete or correct this Information. You can usually do this using the settings and tools provided in your Services account. If you cannot use the settings and tools, contact Customer for additional access and assistance.

To the extent that Mailosaur’s processing of your Personal Data is subject to the General Data Protection Regulation (GDPR), Mailosaur relies on its legitimate interests, described above, to process your data. Mailosaur may also process Other Information that constitutes your Personal Data for direct marketing purposes and you have a right to object to Mailosaur’s use of your Personal Data for this purpose at any time.

Data Protection Authority

Subject to applicable law, you also have the right to (i) restrict Mailosaur’s use of Other Information that constitutes your Personal Data and (ii) lodge a complaint with your local data protection authority or the Information Commissioner’s Office, which is Mailosaur’s lead supervisory authority in the European Union. If you are a resident of the European Economic Area and believe we maintain your Personal Data within the scope of the General Data Protection Regulation (GDPR), you may direct questions or complaints to our lead supervisory authority:

UK Information Commissioner’s Office
Wycliffe House
Water Lane
Cheshire SK9 5AF
United Kingdom

Phone: 0303 123 1113
Fax: 01625 524 510

Mailosaur Ltd is registered with the Information Commissioner’s Office with registration number Z3554772.

Contacting Mailosaur

Please also feel free to contact Mailosaur if you have any questions about this Privacy Policy or Mailosaur’s practices, or if you are seeking to exercise any of your statutory rights. You may contact us at