SendBridge
SendBridge · Writing · Marketing
SendBridge is an email verification service that cleans lists in bulk and checks addresses in real time through an API. It flags invalid, risky, and disposable emails before you hit send.
About SendBridge
What Is SendBridge
SendBridge is a web based email verification service built for one job: keeping bad addresses out of your sending list. You upload a file, the system runs each address through syntax checks, domain and MX lookups, and a set of reputation tests, then hands back a clean list. The same engine is available as an API, so you can verify addresses at the moment someone signs up instead of weeks later.
The problem it solves is boring but expensive. Every invalid address you mail adds a bounce, and a high bounce rate tells inbox providers that your sending habits are sloppy. SendBridge sorts each address into Deliverable, Undeliverable, Risky, or Unknown, so you can cut the dead weight and keep the borderline cases for a second look. Its own marketing puts accuracy at 99%, which is a vendor claim rather than an independent audit.
The limits matter too. Catch-all domains still produce uncertain results, because the receiving server accepts mail for any name at that domain. Credits are sold in prepaid packs rather than monthly seats, so light users need to think about volume before buying. And the app is deliberately plain: upload, wait, download. If you want a full CRM or campaign builder, this isn't it.
Getting Started
- Create a free account at app.sendbridge.com. The free tier includes 100 checks per month.
- Upload your list from the client area. SendBridge accepts the usual contact file formats and keeps your original row order.
- Pick a validation depth. Larger credit packs run three validation passes, smaller packs run two.
- Download the results as XLSX, CSV, or TXT, then remove or quarantine the addresses marked undeliverable or risky.
Product Information
A quick look at SendBridge's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Founders running cold outreach
- Marketing teams with inherited lists
- Developers building signup or checkout forms
- Agencies managing several client accounts
Tasks
- Cleaning a purchased or scraped list
- Checking addresses as they arrive
- Pre-campaign hygiene
- Diagnosing inbox placement
Scenarios
- Right before a product launch email
- After a webinar or lead magnet
- During a CRM migration
Key features
Bulk email list cleaning
Upload a file and the service checks every row, then returns the same rows in the same order with a result attached to each one. SendBridge says it can process 100,000 addresses in about 30 minutes. That speed makes it practical to re-run a list before every major campaign rather than treating cleaning as a yearly project.
Real-time email verification API
A single GET request to api.sendbridge.com returns a JSON payload with more than ten evaluation factors and a score from 0 to 99. The response separates syntax problems, disposable domains, role accounts, and temporary delivery failures, so your code can decide whether to block, warn, or accept a signup. Official examples cover Go, Java, PHP, Python, and .NET.
Risky address detection
Beyond simple valid or invalid sorting, the email checker flags spam traps, role accounts like info@ or sales@, catch-all servers, and disposable addresses. These are the contacts that quietly damage sender reputation. Marking them as risky instead of deleting them outright lets you decide whether a given campaign can tolerate the uncertainty.
Deliverability scoring and categories
Every address lands in one of four buckets: Deliverable, Undeliverable, Risky, or Unknown. The score adds a numeric layer on top, which helps when you want a cutoff rule rather than a binary decision. For teams that send from a shared domain, this is the difference between a rough guess and a defensible policy.
Free mail tester
SendBridge also runs a free email deliverability test that mirrors the common mail-tester workflow without the three tests per day limit. It reports a 0 to 100 score, checks SPF, DKIM, and DMARC alignment, and scans more than 20 blacklists plus reverse DNS. No account is needed, which makes it a quick way to rule out authentication problems before blaming the list.
Export in your original format
Results come back as XLSX, CSV, or TXT, and the row order matches your upload. That sounds minor until you try to reconcile a cleaned list with a CRM that keys on row position. Keeping the order intact removes a manual matching step from the workflow.
Pros and cons
Pros
- Per email pricing drops to $0.0001 at the top volume, which is cheap for large one-off cleans.
- Credits never expire, so seasonal campaigns don't punish you for buying in bulk.
- The API response exposes individual factors and a score, not just a yes or no.
- A free tier of 100 checks per month covers small lists and API testing.
- The free mail tester is genuinely useful and doesn't require an account.
Cons
- You buy credits upfront, so there's no monthly plan that scales down when volume drops.
- Catch-all domains remain uncertain, which means some addresses will always need manual judgment.
- The free allowance is small, and 100 checks won't clean a real marketing list.
- The client area is built around upload and download, so ongoing list management still happens in your own tools.
Frequently asked questions
It verifies email addresses in bulk or one at a time and tells you which ones are safe to mail. Each address gets a category and a score, and you can export the cleaned list or call the same engine through an API.
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