1. Preamble

By using PostBack.email by QuantixEra Limited (also “postback.email” “pbmail”, “we”, “us”, “this/the service”, “this/the website”, “this/the site”), you (also “user”, “the user”, “end user”, “customer”, “account”) accept these terms and the Privacy Policies (separate agreement) and agree to ABIDE BY THEM AT ALL TIMES WITH NO EXCEPTION, and with no right to a refund in the event of terms violation.

You accept that any of these policies and procedures will be available on the website but that THESE TERMS MAY CHANGE AT ANY TIME WITHOUT NOTICE - you have been warned.

Terms and policies apply to paid and unpaid features of PostBack.email.

The parties will comply with all applicable laws, rules and regulations, including without limitation to those arising out of data privacy or any other rights or obligations set forth in this Agreement.

Each party represents and warrants that:

  1. it has full authority to enter and execute and perform its obligations under this Agreement;
  2. this Agreement will constitute a legal, enforceable and binding obligation between the parties;
  3. its execution and performance of this Agreement will not violate any law or breach any other agreement with or obligation to any third party.

2. Warnings and Acceptable Use

2a. Illegal is defined as against the law in the Republic of Cyprus, and the applicable jurisdictions of the end user (you).

2b. This website can never be used to break the law.

2c. You will not send unsolicited spam to or from this service and you will comply with CAN-SPAM and GDPR as well as applicable international, national, and local spam laws in your jurisdiction and the Republic of Cyprus.

2d. This website and its overseers may cooperate with legal enforcement authorities to uphold law enforcement, without necessarily notifying the user of such coorporation.

2e. This website can never be used for malicious activity, terrorist activity, planning illegal activities, discussing illegal activities, gambling, pornography, or condoning illegal activities.

2f. This website can never be used to spread spam, untruth, gambling, pornography of any kind whether legal or illegal.

2g. Apparent terrorism or threatening behavior, harmful messages or usage to conduct intolerant or hateful or discriminatory actions, whether carried out, intended, or simulated, proven or unproven, will be blocked and removed without notice, and potentially handed over to the proper authorities.

2h. This website RESERVES THE RIGHT TO BLOCK OR DELETE MAIL WITHOUT ANY NOTICE OR REASON, INCLUDING DATA RETAINED BY PAID USERS. The user agrees to take action outside PostBack.email services to engage in a backup strategy, when persistence is desired or required. ALL POSTBACK.EMAIL DATA, INCLUDING EMAIL CONTENTS AND EMAIL ADDRESSES, MUST BE CONSIDERED EPHEMERAL BY THE USER.

2i. You agree to be a good citizen of this service and will not engage in any activity which degrades the quality, experience or integrity of it, and accept that if we determine you are degrading the service for others, your usage may be limited in a way which may be undesirable to you.

2j. This service reserves the right to delete or block any email for any reason without notice and without stating any reason.

2k. Unless otherwise indicated, by using the service you acknowledge that all of your incoming emails are public, not private, and unsecured, and not under copyright or ownership.

2l. This service makes no guarantees about how long email will be retained, neither minimum nor maximum, or that email will be accepted or received.

2m. This service is offered for use with NO WARRANTIES and MAKES NO PROMISES THAT IT WILL FUNCTION AS INTENDED OR UNINTENDED. There is no “service level agreement” nor any guarantee of service uptime.

3. Commercial and Non-Commercial Use

3a. Personal (where personal is non-business and non-commercial) use of this website is free, though it may require the user to register for an account and provide information such as a legal name, username, email address, phone number, physical address, and password. We will store the password using a one-way hash which cannot be retrieved by PostBack.email.

3b. Using this service for any business operations, even once, necessitates the purchase of a subscription-based license. Incorporated or non-incorporated business use is prohibited without a paid recurring active commercial subscription.

3c. An exception the previous clause (3c) is made when a business is evaluating the service on a temporary trial basis. Service usage for evaluation purposes will require the business to abide by these terms, the acceptable use guidelines, and the Privacy Policy (separate agreement).

3d. PostBack.email services and customer assets (aka “entitlements”) such as email addresses or custom domains, API keys, or other service features, will be locked or released publicly if an account’s payment status becomes past due (aka “delinquent” or “unpaid invoice”). Past due accounts will receive courtesy payment reminder emails. POSTBACK.EMAIL IS NOT RESPONSIBLE FOR MISSED EMAIL NOTIFICATIONS RESULTING IN CANCELED SERVICE.

4. Email

4a. Public and Private Email

This site might provide public disposable email services and mixed public-private email testing services. Email inboxes that are not purchased (aka private) are public and have no expectation of privacy.

Private addresses will not be accessible publicly and access to messages will be provided only to those with: - a validated username and password, which grants a temporary access “session” which may be stored in a cookie - a validated API key (smtp key, api access key, or other key)

If you believe your username, password, or API key has been compromised, you agree to: 1. change your compromised password, or delete the compromised API key 2. and contact the PostBack.email support email address immediately.

PostBack.email does not accept responsibility for any damages done by compromised accounts. Users acknowledge that overseers and associates (internal or external parties) may have access to inbox contents for the purpose of ongoing business operations, but that access and insight will be limited based on direct need, such as but not limited to: - billing and subscription help - troubleshooting SMTP or API issues reported by you, or issues alerted by PostBack.email telemetry systems - system integration support from PostBack.email to you - comprise the standard reasons for such access

We may aggregate information included in emails, inbound and outbound metadata, email attachments, or email body information, for sale or sharing with third parties or customers. This aggregated information is useful for understanding system trends, spam and viruses sent by malicious systems.

The Privacy Policy supercedes this agreement, and outlines additional detail around sharing of public and private email. When in doubt, THE USER ASSUMES CONTENTS OF THEIR DATA ON POSTBACK.EMAIL.COM MAY BE SHARED WITH OTHER PARTIES. PostBack.email is not a service for conducting sensitive or private matters.

4b. Receipt, Delivery, and Message Accuracy Guarantees

EMAIL MESSAGE RECEIPT OR DELIVERY IS NOT GUARANTEED. PostBack.email has many processes and systems in place built up over years, which result in high availability and reliability. Nonetheless the service does NOT provide a Service Level Agreement or any certainty of either receiving OR sending mail.

While this service does not intend for messages to be altered, there may be arbitrary changes whether during transit or storage which are made without knowledge of the user. The user’s account username and IP address may be attached to inbound or outbound email messages.

We cannot guarantee accuracy of any email content. Furthermore this service does not know the quality, truthfulness, correctness, or origination of messages received. Email messages may contain viruses. Users acknowledge this and will not hold PostBack.email responsible for the content of messages. Users acknowledge that outside parties often send malicious code, phishing (intentionally misleading content), and spam in email messages, and PostBack.email is unable to accurately determine whether messages are malicious or not. Spam ratings and spam scores are for informational purposes only - the user acknowledges these may indicate non-spam is spam, and spam is non-spam.

4c. Email Security

The user acknowledges:

  • SMTP and its variants are insecure by design
  • SMTP is a fail-prone protocol
  • SMTP is a “legacy” technology which lacks modern security best practices
  • the SMTP protocol is not guaranteed to be transmitted under encryption
  • when encrypted in transit, email may use broken or insufficient encryption algorithms
  • stored emails may not be encrypted at rest
  • third parties (including but not limited to routers, ISPs, intermediary providers, email providers including PostBack.email) may decrypt and store email, even though it was not the message’s final destination
  • PostBack.email strives for encrypted traffic (HTTPS with TLS, SMTP with TLS), however internal traffic or even public API / UI traffic may be transmitted unencrypted

4d. Sending Outbound MailOutgoing mail (if offered by PostBack.email) may be purchased at cost and may be delivered (relayed) by a third party OR PostBack.email. The user and sender of this mail is responsible for the content they send. Delivery cannot be guaranteed. Messages which fail to be delivered (including but not limited to “bounces”) will not be refunded. Contact PostBack.email support if delivery appears to be failing and we may be able to assist with troubleshooting, but again we make no guarantees about outbound message delivery.

Outgoing mail may be marked as spam by receivers or intermediary deliverers. PostBack.email is not responsible for email delivered by PostBack.email being marked as spam, and WILL NOT refund such mail which is marked as spam or undelivered or unviewed.

Sending spam email is a serious offense which may result the user’s account being immediately disabled.

IN THE EVENT THAT LEGAL EXPENSES OR FINANCIAL JUDGEMENTS ARE INCURRED FOR THE SENDING OF EMAIL MESSAGES BY A POSTBACK.EMAIL USER, THE USER AGREES TO ACCEPT ALL FINANCIAL RESPOSIBILITY FOR THE PAYMENT OF THOSE FEES OR JUDGEMENTS. WHETHER SENT INTENTIONALLY OR UNINTENTIONALLY BY THE POSTBACK.EMAIL ACCOUNT OWNER, THE USER ACCEPTS FULL RESPONSIBILITY FOR THE MESSAGES SENT. The user is responsible for ALL mail sent from their account even during a period that the account was compromised. It is the responsibility of the account holder (user) to secure their account and contact support via when it appears to have been compromised.

5. Throttling

Inbound and outbound email traffic is throttled due to various dynamic factors, including but not limited to: IP addresses, email addresses, domains, frequency of inbound or outbound mail. PostBack.email may ban traffic automatically, on a permanent or temporary basis. Entire domains and companies may be banned. For an up-to-date list of banned traffic, contact PostBack.email support.

We reserve the right to throttle API and SMTP (inbound or outbound) traffic, even for paid customers on unlimited plans. Throttling is necessary to ensure quality of service for all other customers.

6. Uptime and Support

This service follows a best-effort policy to maintain uptime. No service level agreement (SLA) exists, for any customer, paying or non-paying, personal or commercial. No SLA is offered on any PostBack.email website, including but not limited to: PostBack.email, PostBack.email API, SMTP services, forums, documentation, or blog.

Customers wanting service uptime guarantees must contact a PostBack.email account executive to purchase a Service Level Agreement (SLA) superceding this agreement.

Support response times are not guaranteed, but support will make a best effort to respond promptly. Support is not offered in any language other than US English.

7. Accuracy and Compatibility

7a. PostBack.email provides an API/webhook services. This service is not responsible for adverse effects in any situation, and offers no compatibility guarantee. We reserve the right to change the API/webhook without notice. No guarantees are made on the following:

  • API/webhook uptime or downtime
  • API/webhook changes or API versioning
  • API/webhook incompatibility
  • API/webhook support for a particular programming language
  • API/webhook help in any language other than English

7b. We make our best effort to produce bug free software and accurate documentation. However, the user acknowledges that the service may perform sub-optimally and in a way that is unexpected, and in such cases PostBack.email is not responsible. We make no guarantees that the service will function as described or intended, but we hope it does so. There is no guarantee that documentation about the service, including the API/webhook or email routing or email privacy, will be accurate.

8. Data and Retention

8a. Deleted data (including messages/email) are removed from the servers and the databases using standard deletion practices. However, we cannot guarantee that backups may not exist or that business partners (such as hosting companies) will delete this data. Services which crawl publicly available content (most emails on this website are public) may retain that information indefinitely and this website is not responsible. This website makes no guarantees about retention practices but intends to have deleted content be deleted. Standard application logs and failed attempts to pass data between internal services may be retained for troubleshooting. PostBack.email is a best-effort, disposable-first email service and API.

PostBack.email is not a service that is intended to be used for storage of important information.

Saved or “starred” messages are intended to be retained up to the indicated limits on an account, but this is not guaranteed, and starred messages may be removed when older than other stored messages.

The user agrees that PostBack.email is never responsible for lost data. It is the user’s responsibility to backup or retain any data they may wish to keep.

If data retention or secure deletion is a concern it is recommend that the user should not use this service, and should find another service upon which to rely.

8b. Usage metrics are tracked. Usage includes but is not limited to:

  • IP addresses of site users and API/webhook users and SMTP connections
  • IP addresses or user accounts of derivable data from service activities

Analytics on received SMTP messages are recorded. We may track which users or IP addresses view which email addresses and messages for internal purposes, and to create features for users or organizations to track their usage.

We do not share this analytics data of individual usage with third parties, except when it is necessary to comply with verified requests of fraud, hacking, or other legally dubious behavior. We use the data internally to study spam, study traffic, respond to scaling needs, and to provide more useful services, or to aggregate anonymously into products. We may choose to sell anonymized or aggregated usage data.

9. Refunds

Refunds are not provided. All purchases are final. Refunds may be provided at the sole discretion of PostBack.email and its overseers. As a general rule, refunds are never given for any reason. In the event the service is down or ceases to operate, any unused services and remaining service purchases are not refunded. We make exceptions on a case-by-case basis with no guarantee as to the methods for determination. ALL SALES ARE FINAL WHETHER SERVICES HAVE BEEN RENDERED OR NOT.

We may make exceptions to this refund policy on a case-by-case basis.

10. Updates to Terms

These Terms and Privacy Policy (external agreement) may change from time to time and all updates will be posted on this website. Users of the site WILL NOT BE NOTIFIED OF CHANGES. WE HIGHLY RECOMMEND USERS REGULARLY CHECK THIS WEBSITE FOR CHANGES TO THE TERMS OF SERVICE, ACCEPTABLE USE POLICY, AND PRIVACY POLICY.

If the lack of notification of terms changes presents a concern, contact support for a different arrangement.

11. Warranty and Liability



12. Privileges

This service retains the right to revoke or deny access to anyone at anytime, with or without stated reason. Likewise any user may cease using the service and request that data be removed, in accordance with the data and retention policies outlined herein and in the jurisdictions indicated herin. As indicated above, refunds are not given.

13. Payment of Fees

Unless another agreement signed by PostBack.email exists, payments for services are made up front using a credit card. Serivces will not be rendered until paid in full and cleared with Stripe.com. Returned or stopped payments will be subject to a $30 charge to be paid by the customer of PostBack.email via credit card. Accounts in past-due status will be locked and unusable until paid in full.

Paying customers may have payments arrangements other than via credit card, if agreed by both parties. PostBack.email may submit invoices for fees and expenses to the customer electronically at an accounts payable email address provided by the customer. Payments shall be made net thirty (30) days after receipt of invoice by the customer. PostBack.email services will not be started or restarted until the business day following receipt of payment or purchase order by PostBack.email from the customer.

14. Intellectual Property

For paying customers, PostBack.email warranties that all Intellectual Property delivered under this agreement will be of original development by PostBack.email or subject to appropriate license and will not infringe or violate any patent, copyright, trade secret, trademark, or other intellectual property right of a third party.

When service is not delivered under a paid agreement, no such Intellectual Property warranty is provided.

15. CCPA

PostBack.email agrees to render services consistent with the “California Consumer Privacy Act” (“CCPA”) Cal. Civ. Code Title 1.81.5, § 1798.100 et seq. Requests related to Personally Identifiable Information (PII) or CCPA may be sent to the PostBack.email support email listed in this agreement, and PostBack.email will make every effort to respond within 20 days.

The user agrees to remove confidential information and PII (“sensitive information”) from PostBack.email systems at the earliest extent possible through features provided to the user in the PostBack.email platform, such as, but not limited to, (i) deleting email messages containing the sensitive information, or (ii) bulk deleting all email for a custom domain when containing the sensitive information.

The user agrees that PostBack.email is not responsible for damage caused by sensitive information made public through the Customer’s use of the PostBack.email platform, such as, but not limited to, (i) user making email for a custom domain public by changing settings, or (ii) user sharing public links to private content with embedded access credentials.

If either party discovers or receives notice of an actual breach of security relating to sensitive information in its possession or control, it will immediately notify the other of such breach, and will promptly investigate and take all reasonable steps to cure the breach.

16. Information Assurance Program

For paying customers, PostBack.email will provide an outline of business practices related to cybersecurity and continuity. This agreement is subject to the practices contained within th Information Assurance Program. As the Information Assurance Program is a living document, the customer may elect to receive updates to it by providing PostBack.email with an email address, or contacting PostBack.email support. Only electronic copies of the Information Assurance Program will be provided (no physical copies or mail).

17. Business Continuity

For paying customers only, PostBack.email shall maintain, and shall implement when necessary, a written business continuity plan (“BCP”) that permits it to recover from a triggering event and continue providing Services to user within the specified recovery time objectives. The BCP will be written and maintained in the PostBack.email Information Assurance Program, available upon request to paying customers.

18. Indemnification

Each party agrees to indemnify, defend, and hold harmless the other party from and against any loss, cost, or damage of any kind (including reasonable outside attorneys’ fees) to the extent arising out of its breach of this Agreement, and/or its negligence or willful misconduct.

19. Insurance

The parties will, at their own cost and expense, obtain and maintain in full force and effect during the term of this Agreement the following insurance coverages:

  • Commercial General Liability
  • Cyber Security Liability

20. Other Agreements

If a clause of this agreement is found to be invalid or violated, the rest of this agreement still stands.

This agreement represents the entire agreement between the user and QunatixEra Limited, which includes the Privacy Policy. The two parties may supersede parts of this agreement through writing signed by legal representatives of both parties. Clauses of this agreement not addressed in any superseding agreement will still stand.

Both parties may assign this agreement, or any rights or obligations hereunder, including the right to enforce all of its terms, (i) in connection with a merger, acquisition, corporate reorganization, change in control or sale of all or substantially all of its assets or (ii) to an Affiliate (that is an Affiliate at the time of such assignment).

No waiver by any party at any time of any other provision of this agreement will be deemed a waiver or breach of any other provision of this agreement or consent to any subsequent breach of the same of any other provision.

This agreement will be governed in all respects, including validity, interpretation and effect, by the laws of the Republic of Cyprus without regard to principles of conflicts of law therein. Jurisdiction and venue for any claims shall be lie in:

  • Nicosia Cyprus

21. Contact

Support email address: [email protected]

By using any of PostBack service you give us a none reversible approval to use your submitted information on order to contact you directly or thru a third party in order to offer you other services offred by us or by affiliated parties.

22. Cookies

By using any of PostBack.Email service the user confirms and approve to PostBack.Email to use cookies in order to monitor different aspects of the site’s usage. The cookies might be generated by PostBack.Email or by affiliated partners, or by none affiliated 3rd side parties (like Google)