38 answers to your questions
Frequently Asked Questions
Everything you need to know about MailVeri email verification.
General Questions
What is email verification?
Email verification is the process of checking if an email address is valid, exists, and can receive messages. It helps you maintain a clean email list by removing invalid, disposable, and risky email addresses before you send marketing campaigns or transactional emails.
What is the meaning of each status in the report?
Each email is categorized with one of the following statuses:
- VALID – Email exists and can receive messages safely
- INVALID – Mailbox does not exist or is disabled
- DISPOSABLE – Temporary email address that will be deleted
- ROLE_ACCOUNT – Role-based email (info@, support@, admin@)
- CATCH_ALL – Domain accepts all emails but may not deliver
- FULL_INBOX – Mailbox is 100% full and cannot receive mail (exclude from campaigns)
- UNKNOWN – Could not verify, try again later
What is a FULL_INBOX status, and why don't full mailboxes bounce immediately?
A FULL_INBOX status indicates that an email address exists and is active, but its storage quota has reached 100% capacity. Because there is zero storage space available, the destination mail server refuses to deliver incoming emails.
Why don’t full mailboxes bounce right away? In the SMTP specification (RFC 5321), mailbox quota rejection is commonly treated as a Soft Full temporary deferral (SMTP code 452 User quota exceeded) rather than a permanent rejection (552). When sending services like Gmail, Google Workspace, Amazon SES, SendGrid, or Mailgun receive code 452, they do not generate an immediate bounce. Instead, they hold the message in an internal deferred retry queue for 24 to 48 hours, hoping the recipient will delete old emails to free up storage space. Only after 48 hours of repeated failed retries does the ESP finally give up and send a delayed bounce notice.
The risk to senders: In practice, over 95% of full mailboxes on free or abandoned domains are permanently inactive. If you send campaigns to them, these delayed bounces strike your sender reputation all at once 48 hours later, frequently pushing your bounce rate past ESP suspension limits (5% warning, 10% instant account ban). MailVeri detects quota saturation during the verification handshake and tags them as FULL_INBOX, allowing you to exclude them before sending and keep your bounce rate near 0%.
What file types do you support for bulk upload?
We support multiple file formats for bulk email verification:
- CSV – Comma-separated values files
- Excel – .xlsx and .xls spreadsheet files
- TXT – Plain text files with one email per line
Files from popular platforms like Apollo.io, HubSpot, and Mailchimp work seamlessly.
How long does verification take?
Single email verification typically completes in under 1 second. For bulk lists, processing time depends on the size: 10,000 emails complete in about 5 minutes, while 100,000 emails take approximately 30 minutes. You'll receive real-time progress updates in your dashboard.
Do you send any emails during verification?
No, we never send any emails to verify addresses. Our verification process checks if a mailbox exists without delivering any message. This ensures zero impact on your sending reputation.
How often should I re-verify my email list?
We recommend re-verifying your email list every 3-6 months, or before any major email campaign. Email addresses can become invalid due to people changing jobs, abandoning accounts, or domains expiring. Regular verification keeps your bounce rates low.
What is a catch-all server?
A catch-all server is configured to accept all emails sent to a domain, regardless of whether the specific mailbox exists. These are risky because they often don't bounce immediately but can damage reputation later. MailVeri identifies these as CATCH_ALL so you can decide whether to keep or remove them.
What is greylisting?
Greylisting is a spam prevention method where a mail server temporarily rejects emails from unknown senders, asking them to retry later. MailVeri's advanced algorithms handle greylisting automatically by retrying verification at appropriate intervals.
Can you verify Yahoo, Hotmail, and Outlook addresses?
Yes, we verify all major email providers including Gmail, Yahoo, Outlook, Hotmail, iCloud, AOL, and ProtonMail with 99% deliverability rate.
Free Tools
Are the free tools really free?
Yes, our Email Checker, MX Lookup, and Domain Reputation tools are completely free to use directly on our website without creating an account.
Do you save the emails I check in the free tools?
We respect your privacy. For single email verification, we temporarily keep the last 10 emails for display purposes only. Uploaded email lists and verification results are automatically deleted after 30 days, or you can manually delete them anytime from your dashboard.
How is domain reputation calculated?
Our domain reputation score combines multiple factors including MX record validity, presence on blacklists (RBLs), domain age, and historical sending behavior to give you a trust score from 0-100.
What is the limit for the free tools?
The web-based free tools have a generous daily limit to prevent abuse. For higher volume or API access, we recommend creating a free account which gives you 1,000 credits to start.
Credits & Billing
Do credits expire?
No, your credits never expire! Unlike subscription plans that reset monthly, our credits remain in your account indefinitely. Use them at your own pace without any pressure.
What payment methods do you accept?
We accept all major credit cards (Visa, Mastercard, American Express, Discover) and PayPal. All payments are processed securely. Enterprise customers can request invoice-based payment via bank transfer.
Can I get a refund?
Since we provide 1,000 free credits for every new account to test our service quality and accuracy thoroughly before purchasing, we maintain a no-refund policy on all credit purchases. We encourage you to use your free credits to ensure our service meets your needs.
How do credits work?
1 credit = 1 email verification. Credits are only deducted for successful verifications that return a definitive result. Failed verifications or UNKNOWN results are not charged.
How does MailVeri compare in price to ZeroBounce, NeverBounce, or Hunter?
MailVeri is significantly more affordable, offering up to 90% savings. For example, 10,000 email credits cost $9 on MailVeri vs $129 on ZeroBounce ($80 on NeverBounce); 100,000 credits cost $59 on MailVeri vs $649 on ZeroBounce; and 1,000,000 credits cost $299 on MailVeri vs $3,199 on ZeroBounce. Unlike competitors, MailVeri credits never expire and require no monthly subscription.
Can I verify large B2B sales lists from real estate, Apollo, or LinkedIn?
Yes! MailVeri is built for high-throughput bulk list cleaning (CSV, Excel) of up to 1,000,000 emails per batch. It performs multi-step MX/SMTP verification, catch-all detection, and isolates spam traps, role accounts, and disposable addresses to ensure 99% deliverability for cold email outreach.
Do you offer volume discounts?
Yes! Our pricing is tiered based on volume. The more credits you purchase, the lower the cost per verification. For example, 100,000 credits cost $59 ($0.00059 per email), while 10,000 credits start at $9 ($0.0009 per email).
Is there a free trial?
Yes! Every new account receives 1,000 free credits upon signup. No credit card required.
Do you offer monthly subscriptions?
We operate primarily on a pay-as-you-go model so you never lose unused credits. However, we do offer auto-recharge options for high-volume users who want to ensure they never run out.
Can I get an invoice for my purchase?
Yes, invoices are automatically generated for every purchase and are available for download in the Billing section of your dashboard.
Integrations
Do you integrate with Zapier?
Yes, you can connect MailVeri to 5,000+ apps via Zapier. Trigger verifications automatically when a new lead is added to your CRM, form, or spreadsheet.
Can I use MailVeri with WordPress?
Yes! You can integrate MailVeri with WordPress using our REST API. Our API documentation includes PHP examples that work great with WordPress themes and plugins.
Do you support Mailchimp and HubSpot?
Yes! Mailchimp, HubSpot, ActiveCampaign, Salesforce, and other major platforms can export your email lists to CSV. Simply export your list, upload the CSV to MailVeri for verification, then import the cleaned list back to your platform.
Is there a module for Make (formerly Integromat)?
We don't have a dedicated Make module yet, but you can use Make's HTTP module to connect to our REST API and build automation workflows that include email verification steps.
API & Integration
Do you have an API?
Yes! We offer a comprehensive REST API that allows you to integrate email verification directly into your applications, signup forms, or CRM systems. The API supports single email verification and batch processing.
What programming languages do you support?
Our REST API works with any programming language that can make HTTP requests. We provide code examples for cURL, Python, Node.js, PHP, Ruby, and Go.
Is there a rate limit on the API?
Yes, for fair usage we apply rate limits. Free accounts are limited to 10 requests per second. Paid accounts have higher limits based on their tier. Enterprise plans can have custom rate limits.
Do you offer webhooks?
Yes! You can configure webhook URLs to receive notifications when bulk verification jobs complete. This allows for asynchronous processing of large lists without polling our API.
How do I get an API key?
After creating an account, navigate to the API section in your dashboard. You can generate, view, and manage your API keys there.
Security & Privacy
Is my data secure?
Absolutely. All data is encrypted in transit using TLS 1.3 and at rest using AES-256 encryption. Our infrastructure is hosted on secure cloud providers with SOC 2 compliance. We undergo regular security audits.
How long do you keep my uploaded data?
We automatically delete uploaded email lists and verification results after 30 days. You can also manually delete your data at any time from your dashboard. We never share or sell your data to third parties.
Are you GDPR compliant?
Yes, MailVeri is fully GDPR compliant. We process data only for the purposes you specify, implement appropriate security measures, and provide data deletion upon request. We can also sign a Data Processing Agreement (DPA) for enterprise customers.
Do you sell or share my email lists?
Never. Your email lists are yours alone. We don't share, sell, or use your data for any purpose other than verification. Our business model is based on verification credits, not data monetization.
Where are your servers located?
Our infrastructure is distributed globally for speed and redundancy, with primary data processing occurring in secure data centers in the US and EU, depending on your account region settings.
Still have questions?
Our support team is here to help. Reach out and we'll get back to you within 24 hours.