Bulk list verification
Upload CSV, XLS, or XLSX files and let Mailercloud detect the email column automatically. The tool processes lists in the background and preserves original columns on export.
Mailercloud Email Verifier
Mailercloud Email Verifier checks email addresses in bulk, one at a time, or through an API to help reduce bounces and improve deliverability. It is aimed at senders who want to clean lists before campaigns or validate contacts as they are added.
Email verification for bulk lists, quick checks, and API workflows
Mailercloud Email Verifier is an email list cleaning tool for checking whether addresses are deliverable before you send. It supports bulk file uploads, a quick paste-in check for small batches, and an API workflow for programmatic verification.
The product is built to reduce bounces, improve deliverability, and protect sender reputation. Mailercloud says it checks addresses against live mail servers via SMTP, returns a Delivery Score for each address, and lets users work from the same credit pool across bulk uploads, Quick Verify, and the REST API.
Core email verification capabilities
Quick Verify for small batches
Paste up to 50 addresses directly for a fast check without uploading a file. Mailercloud returns a Delivery Score so you can review individual contacts before sending or importing them.
SMTP-based verification with Delivery Score
Mailercloud connects to recipient mail servers via SMTP rather than relying on DNS lookups alone. The product also returns a Delivery Score from 0 to 100 for each address.
List cleanup and suppression exports
The tool identifies duplicate addresses within and across uploaded files. It also supports export of invalid-only results as a suppression file for use in sending platforms.
Bulk, API, and single-entry workflows
Verification can be used through bulk uploads, Quick Verify, or the REST API. The pricing page says API access includes up to 50 emails per request and returns structured JSON results.
Advanced risk detection on higher plans
The pricing page notes spam trap and risk detection on Growth, Scale, and Enterprise plans, including disposable and role-based address flags.
Where Mailercloud Email Verifier fits
Pre-campaign list cleaning
Check a mailing list before a campaign to remove invalid, risky, and disposable addresses. Mailercloud positions this as a way to reduce bounce rates and protect sender reputation before send time.
Sign-up form and CRM validation
Review addresses as users enter them through a form, CRM, or data pipeline. The API workflow is designed for programmatic verification at the point of entry.
Fast checks for small batches
Paste a short list of contacts and verify them without creating a file. Quick Verify is intended for validating small batches before adding contacts to a campaign or CRM.
Database hygiene before migration
Verify a large database before migration or a high-volume send. The bulk workflow supports large files, background processing, and export of invalid-only results for suppression lists.
Programmatic list screening
Use the API to incorporate verification into internal tools or automated workflows. Mailercloud says the API returns structured JSON, which makes it suitable for downstream processing.
Pros and Cons
Pros
- Supports both bulk uploads and one-at-a-time verification.
- Checks mail servers via SMTP instead of relying on DNS lookups alone.
- Provides a numeric Delivery Score rather than a simple pass/fail result.
- Works across uploads, Quick Verify, and the REST API with the same credit balance.
- One-time purchase credits never expire.
Cons
- Catch-all domains may be marked as Risky because the server accepts all addresses without confirming individual mailboxes.
- Bulk verification for larger files can take longer because each address is checked in real time.
- Advanced spam-trap and risk detection is not described as available on every plan.
FAQ
Can I verify emails programmatically with the API?
Mailercloud says you can create an API key from your dashboard and submit up to 50 email addresses per request. The API returns structured JSON with a status, reason, and Delivery Score for each address, and it uses the same credit balance as file uploads.
What file formats and file sizes does the email verifier support?
Bulk verification supports CSV, TXT, XLS, XLSX, and XLSM files up to 100 MB. CSV and TXT files can include up to 1,000,000 addresses per file, while Excel formats support up to 100,000 addresses per file.
How does Mailercloud verify an email address?
Mailercloud checks addresses against live mail servers via SMTP and does not send a message to the contact. It also notes that catch-all domains may be marked as Risky because their servers accept all addresses without confirming that a specific mailbox exists.
Do email verification credits expire?
One-time purchase credits do not expire. Mailercloud also says subscription credits renew each billing cycle, and when multiple balances are active, the oldest credits are used first.
How long does bulk email verification take?
Mailercloud says lists under 1,000 emails typically complete within minutes, while larger files take longer. Bulk processing runs in the background, so you can leave the page and return to check progress on the Lists page.
Quick Facts
- Category
- Email verification
- Product type
- List cleaning and verification tool
- Source domain
- mailercloud.com
- Primary workflows
- Bulk upload, Quick Verify, REST API
- Input formats
- CSV, TXT, XLS, XLSX, XLSM
- Pricing note
- One-time credits start at $5 for 1,000 credits; credits never expire
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