Signal Email — Terms of Use

Last edited on 5 June 2026

1. Definitions — Interpretation

“Agreement” means the agreement between You and Signal, comprising these Terms, the Privacy Policy, and (where applicable) your Order.

“Affiliates” means any entity that directly or indirectly Controls, is Controlled by, or is under common Control with Signal.

“App” or “Plugin” means a software extension that runs within the Email Service (in a sandboxed frame) and can access defined categories of data through the Service’s apps framework, subject to the permissions it declares and that an administrator approves. Apps may be provided by Signal (“First-Party Apps”), by third-party developers via the Apps Marketplace (“Third-Party Apps”), or built by You for use within your own account only (“Private Apps”).

“App Provider” means the entity that publishes an App: Signal for First-Party Apps, the third-party developer for Third-Party Apps, and You for Private Apps.

“Apps Marketplace” means the in-Service catalogue from which Authorized Users with administrator rights can discover and install Apps.

“Authorized User” means any individual authorised by You to access and use the Email Service on your behalf and registered or otherwise permitted by Signal under your account, including your employees. Each Authorized User must use unique credentials and keep them confidential.

“Connected Account” means any third-party email account (Microsoft Exchange / Microsoft 365, Google / Gmail, or a generic IMAP/SMTP mailbox) that You connect to the Email Service in order to send, receive, store, and organise email through the Service.

“Email Data” means the content and metadata of email messages and attachments that the Email Service accesses, receives, sends, stores, or indexes through a Connected Account on your instruction, including message headers, sender and recipient addresses, subject lines, message bodies, attachments, timestamps, folder/label information, and message identifiers.

“Email Service” or “Service” means Signal Email, Signal’s email application that connects to your Connected Accounts to send and receive email and to store, index, search, and organise Email Data, together with all related software, features, APIs, interfaces, and Content made available by Signal.

“Google API Services” means the Gmail and related Google application programming interfaces used by the Email Service, and “Google User Data” means data the Service obtains through those services.

“Microsoft Services” means the Microsoft Graph, Exchange, and related Microsoft application programming interfaces used by the Email Service, and “Microsoft Data” means data the Service obtains through those services.

“Intellectual Property” means all proprietary and commercially valuable assets of Signal related to the Service, including software, graphics, trademarks, copyrights, patents, trade secrets, database rights, designs, logos, and any technology or functionality that supports or is necessary for the operation of the Service.

“Order” or “Order Form” means any purchase order signed during your subscription registration which, together with these Terms and the Privacy Policy, forms the Agreement.

“Privacy Policy” means the Privacy, Data Protection & Cookies Policy applicable to the Email Service, available at https://emailapp.signalocean.com/legal/privacy.

“Signal” means the company providing the Service under the Agreement, being Signal Ocean Ltd, a private limited company incorporated under the laws of England and Wales, registered office at 83 Cambridge Street, Pimlico, SW1V 4PS, London, England, together with its Affiliates including Signal Ocean Single Member Private Company (Greece), 110 Vouliagmenis Avenue, Glyfada, 166 74, Greece, or such other affiliated entity designated in your Order.

“Third-Party Services” means Microsoft Services, Google API Services, and any generic IMAP/SMTP server or other third-party service that You connect to or that the Service relies on to deliver functionality.

“You” means the party receiving the Service from Signal, including, where applicable, the business on whose behalf the Service is used and its Authorized Users.

“Your Content” means Email Data and any other content You provide or that the Service accesses on your behalf. Your Content is owned by You (or your licensors), not by Signal.

In the Agreement, unless the context otherwise requires: (a) the singular includes the plural and vice versa; (b) references to any gender include all genders; (c) “including” means “including, without limitation”; and (d) references to any document, law, or regulation include amendments, modifications, or replacements thereof.

2. Introduction and acceptance

By accessing or using the Email Service, You acknowledge that (a) You have read, understood, and agree to be bound by the Agreement, and (b) You will comply with all laws applicable to your use of the Service. If You use the Service on behalf of a business, You represent that You have authority to bind that business to the Agreement.

3. The Email Service

3.1 The Email Service allows You to connect one or more Connected Accounts and to send, receive, read, compose, store, index, search, and organise email through a single interface.

3.2 To deliver the Service, Signal accesses Email Data from your Connected Accounts on your instruction, stores Email Data in Signal’s cloud infrastructure hosted on Microsoft Azure, and stores associated metadata (and chat-related metadata) in Signal’s database. Signal supports persisting data in any global Azure region where a Microsoft datacenter is available; the default region is West Europe, and another supported region can be used to meet your data-residency requirements. Details of what is accessed, where it is stored, and how it is secured are set out in the Privacy Policy.

3.3 The Service may automatically process Email Data to provide user-facing features such as search and indexing, classification and organisation, extraction of structured maritime information (for example fixtures, cargoes, vessel positions, and lineups), and summarisation. Signal uses Email Data only to provide and improve these features for You, and does not use your Email Data to train generalised or foundation artificial-intelligence models. See the Privacy Policy for further detail.

3.4 Signal will use commercially reasonable efforts to make the Service available, subject to planned maintenance (with reasonable advance notice where practicable) and unscheduled maintenance. Signal may modify, add, or remove features at any time.

4. Third-Party Services and Connected Accounts

4.1 Authorisation. When You connect a Connected Account, You authorise the Email Service to access, send, receive, store, and organise Email Data from that account on your behalf, using OAuth or equivalent credentials. You may connect Microsoft Exchange / Microsoft 365 accounts (via Microsoft Services), Google / Gmail accounts (via Google API Services), or generic IMAP/SMTP mailboxes.

4.2 Compliance with provider terms. Your use of the Service in connection with Third-Party Services is also subject to the terms and policies of the relevant provider. In particular:

(a) The Service’s access to and use of Google User Data complies with the Google API Services User Data Policy, including the Limited Use requirements. The Service’s use of information received from Google API Services is limited to providing or improving user-facing features that are prominent in the Service’s interface, and is not transferred or sold except as described in the Privacy Policy.

(b) The Service’s access to and use of Microsoft Data complies with the applicable Microsoft APIs Terms of Use and Microsoft’s data-handling requirements, and requests only the minimum Microsoft Graph permissions necessary to provide the features You use.

4.3 Revocation. You may disconnect a Connected Account or revoke the Service’s access at any time through the Service or through the relevant provider’s account settings. Upon disconnection, Signal will cease accessing new Email Data from that account and will delete or de-identify stored Email Data for that account in accordance with the Privacy Policy.

4.4 No control over Third-Party Services. Signal does not control and is not responsible for the availability, security, or accuracy of Third-Party Services. Your relationship with each provider is governed by your agreement with that provider.

4A. Apps, plugins and integrations

4A.1 Apps framework. The Service includes an apps framework and an Apps Marketplace that let You extend its functionality with First-Party, Third-Party, and Private Apps. Apps run in a sandboxed frame, authenticate with short-lived, account-scoped credentials, and can access only the data permitted by the permissions (scopes) they declare and that an administrator approves on the principle of least privilege.

4A.2 Installation by administrators. Apps are installed by an Authorized User with administrator rights, who reviews and approves the permissions an App requests before enabling it. By installing an App, You authorise Signal to make the data covered by those permissions available to the App, and You are responsible for the Apps You choose to install and for your Authorized Users’ use of them. An administrator may uninstall an App or rotate its credentials at any time, which ends its access going forward.

4A.3 Marketplace approval of Third-Party Apps. Before a Third-Party App may be listed in the Apps Marketplace, it must pass Signal’s app approval workflow, in which Signal reviews the App against its developer and security requirements, including the permissions it requests, its declared data use, and its origin. Only approved Apps are published. Approval is a baseline review intended to reduce risk; it is not an endorsement and does not make Signal responsible for an App Provider’s ongoing conduct or data handling. Signal may decline, suspend, or remove any App from the Apps Marketplace, or revoke its access, where it reasonably determines the App no longer meets Signal’s requirements or poses a risk.

4A.4 Third-Party Apps are independent. A Third-Party App is operated by its App Provider, not by Signal. When You install and use a Third-Party App, data covered by its permissions is shared with that App Provider, who handles it under its own terms and privacy policy, which You should review. Signal does not control and is not responsible for a Third-Party App, including its availability, security, accuracy, or use of data once transmitted to it. Such Apps may transmit data to servers outside Signal’s infrastructure. Your use of a Third-Party App is at your own risk and is governed by your agreement with the App Provider.

4A.5 Private Apps and publishing. Where You build a Private App for use within your own account, or develop and submit an App for publication, You represent and warrant that You have all rights necessary to do so, that the App complies with applicable law and the Agreement, and that it will access and use data only as authorised. You are responsible for your App’s conduct and data handling and act as controller for that processing, and You will comply with Signal’s developer and security requirements. The acceptable-use restrictions in clause 6 apply to Apps You develop, publish, or install.

5. Registration and account management

5.1 Accessing the Email Service requires creating an account and connecting at least one Connected Account. You agree to provide accurate, current information and to keep it up to date.

5.2 You are responsible for maintaining the confidentiality of your credentials and for all activity under your account and that of your Authorized Users. You must notify Signal promptly of any suspected unauthorised access at security@thesignalgroup.com.

5.3 Signal may suspend or terminate access where it reasonably believes the Service is being used in breach of the Agreement, in a manner that poses a security risk, or unlawfully.

6. Acceptable use and restrictions

6.1 You agree to use the Service only for lawful purposes and in compliance with applicable laws (including data-protection, export-control, and anti-spam laws).

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

(a) use the Service to send unsolicited bulk or commercial email (spam), phishing, malware, or other unlawful or harmful content;

(b) attempt to gain unauthorised access to the Service, Third-Party Services, or other users’ data;

(d) reverse engineer, decompile, or extract source code from the Service, except to the extent permitted by law;

(e) resell, sublicense, or make the Service available to any third party other than your Authorized Users, except as expressly permitted;

(f) use the Service in any way that competes with Signal’s business or to build a substitute product; or

(g) remove or alter any proprietary notices.

6.3 You are responsible for ensuring that You have all rights and lawful bases necessary to connect each Connected Account and to allow Signal to process the Email Data within it, including, where applicable, the rights of, and any required notices to, other individuals whose personal data appears in that Email Data.

7. Ownership of data and content

7.1 Your data. As between You and Signal, You (or your licensors) own all right, title, and interest in Your Content, including Email Data. Signal claims no ownership of Your Content.

7.2 Licence to Signal. You grant Signal a limited, non-exclusive, worldwide, royalty-free licence to access, host, store, transmit, index, display, and process Your Content solely as necessary to provide and maintain the Service for You and as described in the Privacy Policy. This licence ends when Your Content is deleted, except for residual copies in routine backups for a limited period and copies retained as required by law.

7.3 Signal’s Intellectual Property. Signal retains all right, title, and interest in the Service and its Intellectual Property. These Terms grant You a limited, non-exclusive, non-transferable, revocable licence to use the Service for your internal business purposes only, and grant You no ownership rights.

8. Fees and payment

The Email Service is a paid service. Fees are set out in your Order and payable in accordance with its terms. The payment, invoicing, and tax provisions of the Signal Ocean Platform Terms (or the applicable master Order) apply to the Service.

9. Confidentiality and data protection

9.1 Each party shall keep confidential the other’s proprietary or sensitive information disclosed in connection with the Service and use it only as permitted by the Agreement, protecting it with at least a reasonable standard of care.

9.2 Personal data. Signal’s collection, use, storage, sharing, and security of personal data in connection with the Service are described in the Privacy Policy, which forms part of the Agreement. Signal acts as a processor of Email Data (and chat content) that it processes on your behalf and on your documented instructions, with You (or your organisation) as controller; and as a controller of account, registration, usage, device, log, security, and billing data, the purposes and means of which Signal determines. The processing Signal carries out as a processor is governed by Signal’s Data Processing Agreement (DPA), which is incorporated into and forms part of the Agreement and meets the requirements of Article 28 of the UK/EU GDPR.

9.3 You confirm that You have provided all notices and obtained all consents or have another lawful basis necessary for Signal to process the Email Data and other personal data You make available through the Service.

10. Disclaimers and limitation of liability

10.1 The Service is provided “as is” and “as available”. To the fullest extent permitted by law, Signal disclaims all implied warranties, including merchantability, fitness for a particular purpose, accuracy, completeness, and non-infringement. Signal does not warrant that the Service will be uninterrupted, error-free, or secure against every threat.

10.2 To the fullest extent permitted by law, Signal and its Affiliates, officers, employees, agents, and providers shall not be liable for any indirect, incidental, special, or consequential loss, or for loss of profits, revenue, goodwill, or data, arising out of or in connection with the Service.

10.3 To the extent permitted by law, Signal’s total aggregate liability for any claim arising out of or relating to the Service shall not exceed the amounts paid by You for the Service in the 12 months preceding the claim.

10.4 Nothing in the Agreement excludes or limits liability that cannot lawfully be excluded or limited.

11. Indemnification

You agree to defend, indemnify, and hold harmless Signal and its Affiliates and providers from any claims, liabilities, damages, losses, and expenses arising from (a) your use of the Service in breach of the Agreement, (b) Your Content, (c) your failure to obtain the rights, consents, or lawful bases referred to in clauses 6.3 and 9.3, or (d) any App You develop, publish, or install, including its access to or use of data and any third party’s claims relating to it.

12. Term, suspension, and termination

12.1 The Agreement continues for the term set out in your Order or until terminated. Either party may terminate for material breach not cured within the period stated in your Order (or, absent an Order, within five (5) days of written notice).

12.2 Signal may suspend access immediately where it reasonably determines that continued use poses a security risk, is unlawful, or may expose Signal or a third party to liability.

12.3 Effect of termination. On termination or disconnection of a Connected Account, all licences granted to You end, You must stop using the Service, and Signal will delete or de-identify stored Email Data and associated personal data in accordance with the retention and deletion provisions of the Privacy Policy, save for copies required to be retained by law and routine backups expiring on their normal cycle. On request made within 30 days of termination, Signal will make available to You an export of your Email Data where technically feasible.

13. General

13.1 Force majeure. Neither party is liable for failure or delay caused by circumstances beyond its reasonable control.

13.2 Notices. Notices shall be sent by email to the address You provided on registration and to legal@thesignalgroup.com for Signal.

13.3 Assignment. You may not assign the Agreement without Signal’s prior written consent. Signal may assign the Agreement to an Affiliate or successor.

13.4 Entire agreement; severability; waiver. The Agreement is the entire agreement between the parties on its subject matter. If any provision is unenforceable, the remainder continues in force. No failure to enforce a right is a waiver of it.

13.5 Changes. Signal may amend these Terms. Where changes are material, Signal will notify You by email and/or in-product notice. Continued use after the effective date constitutes acceptance.

13.6 Governing law and jurisdiction. The Terms and the Agreement are governed by the laws of England and Wales, and the parties submit to the exclusive jurisdiction of the courts of London, England.

14. Contact

Questions about these Terms: legal@thesignalgroup.com. Privacy questions: privacy@thesignalgroup.com.