Email Verification

What is SendBridge Email Verification?

SendBridge Email Verification is a service provided by SendBridge for verifying email addresses and cleaning up address lists. Users can upload lists of emails to conduct batch checks, or they can use the API to assess the risk associated with each email address in real time during registration, subscription, or lead collection processes.

Its purpose is to reduce the number of emails that are returned due to obviously invalid, temporary, or high-risk addresses, as well as to avoid waste of resources; it is not an authentication system for sending verification codes. The term “Email Verification” in the database refers specifically to the SendBridge product.

Main functions

Batch email list cleaning

Users can upload a list of email addresses; the system checks each one individually and provides the results of those checks. The official website states that it takes about 30 minutes to process 100,000 addresses, but the actual speed may still be affected by the scale of the task and the status of the service.

• Check whether the email format and the local part contain any abnormalities.
• Verify the top-level domain, MX records, and A records if necessary.
• Identify one-time or temporary email services
• Mark shared, role, or public-use accounts
• Determine whether the remote server is temporarily unavailable for delivery.
• Generate a comprehensive verification score ranging from 0 to 99.

Real-time API verification

SendBridge offers real-time interfaces based on HTTPS, and it returns the original email address, various boolean values indicating the results of checks, a score, and the processing time in JSON format. It is suitable for use in registration forms, CRM imports, marketing automation processes, or lead synchronization workflows.

The official documentation provides example calls using C#, Go, Java, PHP, and Python. API keys should be stored only on servers or in secret management systems; they must not be included in public web pages, mobile application packages, or front-end scripts.

Risk classification and scoring

The results not only provide a simple assessment of whether something is effective or not, but also reveal information such as free email addresses, abnormal domain names, temporary emails, shared accounts, DNS records, and situations where delivery is temporarily impossible. Teams can establish rules for acceptance, review, and rejection based on business risks.

What problems can SendBridge solve?

• Remove subscribers or customers who have not been maintained for a long time.
• Intercept spelling errors and obviously fake email addresses when the form is submitted.
• Reduce hard bounces caused by invalid addresses
• Reduce the sending of high-cost content to temporary email addresses.
• Add quality tags to contacts in CRM.
• Perform risk stratification on the newly added list before sending out the campaign.

The fact that an email address has passed technical verification only indicates that it is likely to exist and capable of receiving emails; it does not mean that the recipient agrees to receive marketing content. The sender must still obtain proper authorization and provide a clear mechanism for unsubscribing.

Price and points packages

The prices listed below were verified on August 24, 2026, and are expressed in US dollars. 1 point is spent for each email address that is verified; the same rules apply to batch verifications as well as to real-time API calls. Taxes may be additional, and the final amount will be indicated on the settlement page.

The official website states that the points purchased and those granted as part of promotions do not expire, but the terms of service allow the platform to consider an account inactive and delete it if it has not been used for 12 consecutive months. Therefore, it is necessary to confirm how the account and its balance will be handled before leaving the account unused for an extended period.

Refunds and cancellations

Pay-as-you-go integrations are considered prepaid purchases, and the terms generally do not allow for general refunds. A cancellation request can be submitted within 14 days of purchase, but a full refund is only possible in cases such as events that have not been sent or system issues that prevent proper use; the final decision depends on review by the platform.

Usage tutorial

1. To create a SendBridge account, start by using the 100 free credits available per month to test the result format.
2. Organize the legally obtained email lists by removing duplicate entries and fields that are clearly missing.
3. Upload a small number of samples to verify whether the field mapping and export format meet the CRM requirements.
4. View results such as invalid addresses, temporarily undeliverable addresses, shared accounts, one-time email addresses, and ratings.
5. Establish rules for retention, delayed retry, manual review, and deletion based on the business scenario.
6. Before making bulk purchases, estimate the number of unique addresses after deduplication and select the appropriate loyalty package.
7. Download the results, update the original system, and promptly delete the files uploaded to the platform.

API integration steps

1. Create a separate API key in the account’s backend, and restrict the users and services that have access to it.
2. Send a single email address from the server side to the verification interface.
3. Read the format, domain name, DNS, temporary email address, shared account, and rating fields from the JSON.
4. Set connection timeout, retry rules, call limits, and exception handling logic.
5. Do not permanently reject a user based solely on an overall score; instead, provide a pathway for reviewing temporary errors.
6. Record business decisions and only the essential outcomes, avoiding the long-term storage of original emails.

Which users are it suitable for

• Email marketing teams that need to clean up their subscription lists
• SaaS and e-commerce websites that aim to reduce the registration of fake data
• Sales operations teams that need to improve the quality of their CRM contacts
• Agencies that handle the import of large volumes of leads
• Developers who need to verify email addresses in real time within the application

Product advantages

• It supports both batch uploading and real-time APIs.
• Free accounts provide 100 verification points per month.
• There is no standard expiration date for pay-as-you-go integrals.
• The results include more than a dozen risk factors as well as a comprehensive score.
• The official source provides example calls in five common languages.
• The uploaded verification data is retained for a maximum of 30 days by default.

Restrictions and Precautions

Verification does not guarantee delivery.

Email service providers may use catch-all addresses, graylists, temporary rate limits, or anti-detection measures; as a result, the results of technical tests are not absolute. The claims made on official websites regarding delivery rates cannot replace the actual performance of email deliveries or the policies of upstream email services.

Do not accidentally delete temporarily failed addresses.

The temporary unavailability of a remote server does not mean that its address is permanently invalid. For high-value customers or emails related to critical business operations, attempts to connect should be delayed or verified manually, rather than deleting the address right after a single attempt fails.

The user is responsible for the legitimacy of the list.

The terms of SendBridge prohibit spam, as well as the purchase, rental, or use of unauthorized third-party address lists. Users must demonstrate a legitimate basis for collecting addresses and must comply with the privacy and electronic communications regulations in the recipients’ countries.

The scope of the platform goes beyond mere verification.

SendBridge also offers email sending services, and some of its terms address events, contacts, and tracking pixels. Teams that use only the verification feature should still pay close attention to the rules for handling verification data versus email sending data.

Data and Privacy

According to the official FAQ, email data used for verification is retained for a maximum of 30 days, and users can also delete it ahead of time. The privacy policy covers account information, contacts, activity data, Cookies, analytics, and data sharing with service providers; therefore, only necessary fields should be uploaded.

• Confirm that you have the proper authority to handle the list before uploading.
• Do not include any irrelevant or sensitive information outside the email field.
• Download and delete the task as soon as verification is complete.
• Regularly rotate API keys and monitor the number of calls.
• Disclose third-party verification processes to the data subject.
• Enterprises confirm data processing agreements and cross-border arrangements when making purchases.

According to the official privacy statement, the servers are located in Germany, while the operating entity is based in the Czech Republic; third-party service providers may also be used. Organizations that are subject to strict industry regulations should verify separately the location of the data, the security measures in place, and the contractual obligations before uploading any data.

API and open-source status

The ability to view code on GitHub does not imply permission to copy, modify, or redistribute it. If you wish to use these examples in commercial projects, you must first check whether a license will be provided for the repository or obtain explicit authorization from SendBridge.

Frequently Asked Questions

Is SendBridge free?

Free accounts receive 100 verification points per month, and no credit card is required. Once this limit is reached, one can purchase pack of points; 1 point is spent for each email address that is verified.

Will the purchased points expire?

The official website states that points do not expire, but accounts that are not logged in for 12 consecutive months may be deleted. It is advisable to assess the risks related to account activity and any changes in services before making long-term deposits.

Can it recognize temporary email addresses?

Yes, the API results include a check for one-time use email addresses; it also verifies syntax, domain names, MX records, shared accounts, and situations where delivery is temporarily not possible.

Can marketing emails be sent once the email address has been verified?

No. Technical effectiveness and marketing permissions are two different things; it is still necessary to obtain the recipient’s consent and comply with anti-spam and privacy regulations.

Is SendBridge open source?

The platform is not open source. The developers only provide examples of API calls in multiple languages; no license is indicated in the repository, so it cannot be classified as an open source SDK.

Summary

SendBridge is suitable for teams that need to clean up lists on a large scale or to verify email addresses in real time as part of their business processes; its pay-per-use model also makes it easier to control costs. When using it, rules should be established based on specific risk factors, and list authorization, data minimization, and monitoring of rejected emails should all be carried out before reviewing the verification results.