What is an email verifier?+
An email verifier is a tool that checks whether an email address is valid, deliverable, and safe to send to — without actually sending an email. It runs the address through a series of tests: syntax checks, DNS lookups, MX record checks, SMTP probes, and risk scoring. The result tells you whether the address is valid (safe to send), invalid (will bounce), risky (might cause issues), or unknown (couldn't be confirmed).
How does Expetize verify emails without sending one?+
We use a technique called an SMTP handshake probe. We connect to the recipient's mail server and simulate the beginning of an email delivery — asking "does this mailbox exist?" — and then immediately disconnect before any actual message is sent. The mail server responds with a confirmation or rejection, which tells us whether the mailbox is real. This is the same method used by all professional email verification services.
What checks does Expetize run on each email?+
Every email goes through 10+ verification layers:
1. Syntax check — Is the format valid? (RFC 5321/5322 compliance)
2. Typo correction — Common mistakes like gmial.com, yaho.com
3. DNS resolution — Does the domain exist?
4. MX record check — Is there a mail server configured to receive email?
5. SMTP probe — Does the specific mailbox exist?
6. Catch-all detection — Does the server accept everything regardless?
7. SPF record check — Does the domain publish an SPF policy?
8. DMARC record check — Is there a DMARC authentication policy?
9. Blacklist lookup — Is the domain on Spamhaus DBL or SURBL?
10. Disposable email detection — 200+ known temp mail providers
11. Role-based detection — info@, admin@, noreply@ flagged automatically
12. Company intelligence — Company name, type, and country
What do the verification statuses mean?+
✓ Valid (Deliverable) — The email address exists and the mailbox is able to receive mail. Safe to send.
✗ Invalid — The email address does not exist, has a bad format, or the domain has no mail server. Sending will result in a hard bounce. Remove from your list.
⚠ Risky — The address may exist but sending to it carries a risk. This includes catch-all addresses, role-based addresses (info@, admin@), disposable emails, or addresses on domains with poor reputation.
? Unknown — The mail server didn't respond, returned an inconclusive result, or blocked our probe. The address could be valid or invalid — we simply couldn't confirm either way. This is common with some large providers like Google that actively block verification probes.
What is a catch-all (accept-all) email address?+
Some organizations configure their mail servers to accept any email sent to their domain — even if the specific mailbox doesn't exist. These are called catch-all or accept-all domains. The mail server says "yes" to every address, so it's impossible to confirm whether john@company.com is a real inbox or just disappears into a black hole. We flag these as Risky and clearly label them as catch-all so you can make an informed decision about whether to include them in your sends.
Why are Gmail and Google Workspace addresses often marked as "Unknown"?+
Google deliberately blocks SMTP verification probes to prevent email harvesters from confirming whether Gmail addresses exist. This means we can't complete the mailbox handshake for Gmail, Google Workspace, and some other major providers. We verify everything else we can (syntax, domain, MX records, SPF, DMARC) and return an Unknown status rather than guessing. This is the honest, correct behavior — any tool claiming to definitively verify Gmail addresses with 100% accuracy is not telling the truth.
How do I upload emails for bulk verification?+
Log into your
dashboard and click
New Job. You can either upload a CSV file (any column containing email addresses will be detected automatically) or paste a list of emails directly into the text box. Once submitted, verification runs in the background and you can watch results arrive in real-time. You'll be notified when the job is complete and your cleaned CSV is ready to download.
What file formats does bulk verification accept?+
Bulk verification accepts CSV files — the most universal format for email lists. Your CSV can have any number of columns; our system automatically detects which column contains email addresses. You can also paste emails directly (one per line, with or without names). There's no strict limit on rows, though very large jobs (100K+ emails) are processed in batches for reliability.
Can I pause or cancel a verification job?+
Yes. From the job page or your history, you can pause any running job at any time — processing will stop after the current batch completes, and your progress is saved. You can resume at any point. You can also delete a job entirely; any unprocessed credits are automatically refunded to your account balance.
What does the deliverability score mean?+
The deliverability score (0–100) is a composite rating based on all verification checks. A score of 70–100 is considered safe to send. 40–69 is risky and should be reviewed. 0–39 means the address should be removed from your list. The score factors in mailbox existence, domain reputation, authentication records (SPF/DMARC), whether it's disposable or role-based, and blacklist status.
What are verification credits and do they expire?+
One credit equals one email verification. Credits are deducted only after a job completes — if you delete a job mid-way, unused credits are refunded automatically. Credits never expire — buy them when you need them and use them at your own pace. New accounts start with 1,000 free credits, no credit card required.
Is my data kept private and secure?+
We take data privacy seriously. Your email lists are used solely for the purpose of verification and are never sold, shared, or used for marketing. Results and job files are stored securely and accessible only to your account. You can delete any job and its associated data at any time from your dashboard. We do not retain your email lists after you delete them.
How accurate is Expetize compared to other tools?+
Our verification pipeline runs the same core checks as industry-leading tools — DNS, MX, SMTP handshake, SPF/DMARC, blacklist, disposable, and role-based detection. Where we return Unknown, other tools may return a confident but incorrect result. We believe accurate uncertainty is more valuable than false confidence. Our goal is to match or exceed the accuracy of tools like Hunter, ZeroBounce, and NeverBounce on all domains where verification is technically possible.
Do you have an API?+
An API is currently in development and will be available soon for Pro and Business plan users. It will support both single-address verification and bulk submission. If you have a specific integration need or want early API access,
get in touch and we'll work with you directly.
What is an email verifier?+
An email verifier is a tool that checks whether an email address is valid, deliverable, and safe to send to — without actually sending an email. It runs the address through syntax checks, DNS lookups, MX record checks, SMTP probes, and risk scoring. The result tells you whether the address is valid, invalid, risky, or unknown.
How does Expetize verify emails without sending one?+
We use an SMTP handshake probe. We connect to the recipient's mail server, simulate the start of a delivery to ask "does this mailbox exist?", then immediately disconnect before any message is sent. The mail server's response confirms or rejects the mailbox — all without delivering anything.
Is my data kept private and secure?+
Your email lists are used solely for verification and are never sold, shared, or used for marketing. Results are accessible only to your account. You can delete any job and its data at any time from your dashboard, and we do not retain your email lists after deletion.
Do I need to sign up to verify a single email?+
No — you can verify a single email address right on this page with no account required. For bulk verification (uploading a list), you'll need a free account.
Sign up here — it only takes a minute and you get 1,000 free credits instantly.
What do the verification statuses mean?+
✓ Valid — Exists and can receive mail. Safe to send.
✗ Invalid — Doesn't exist or will hard bounce. Remove from your list.
⚠ Risky — May exist but carries risk (catch-all, role-based, disposable, blacklisted domain).
? Unknown — Server didn't confirm either way. Common with Google who blocks verification probes.
What is a catch-all (accept-all) email address?+
Some organizations configure their mail servers to accept any email sent to their domain — even if the mailbox doesn't exist. We detect this with a double-probe method and flag these as Risky / Catch-all so you can decide whether to include them.
Why are Gmail addresses often marked as "Unknown"?+
Google deliberately blocks SMTP verification probes. We verify syntax, DNS, MX, SPF, and DMARC, but can't complete the mailbox handshake. Any tool claiming to definitively verify Gmail addresses is not being truthful — Unknown is the correct, honest result.
What does the deliverability score mean?+
The score (0–100) combines all check results. 70–100 = safe to send. 40–69 = risky, review carefully. 0–39 = remove from your list. It factors in mailbox existence, domain reputation, SPF/DMARC, disposable/role-based flags, and blacklist status.
How accurate is Expetize compared to other tools?+
We run the same core pipeline as tools like Hunter, ZeroBounce, and NeverBounce. Where we return Unknown, other tools may return a confident but incorrect result. We believe accurate uncertainty is more valuable than false confidence.
How do I upload emails for bulk verification?+
Log into your
dashboard and click
New Job. Upload a CSV file or paste emails directly. Our system auto-detects email columns. Verification runs in the background with live progress — download your results when complete.
What file formats does bulk verification accept?+
We accept CSV files with any column structure — email addresses are detected automatically. You can also paste emails directly, one per line. There's no strict row limit, though very large jobs (100K+) are processed in batches for reliability.
Can I pause or cancel a verification job?+
Yes. You can pause any running job — processing stops after the current batch and your progress is saved. Resume anytime. You can also delete a job; unprocessed credits are automatically refunded to your balance.
How long does bulk verification take?+
Speed depends on the mail servers being contacted and their response times. As a rough guide: 1,000 emails typically takes 5–15 minutes. 10,000 emails takes 45–90 minutes. Results appear in real-time as each batch completes — you don't need to wait for the whole job to finish before reviewing results.
What does the downloaded CSV include?+
The results CSV includes: email address, verification status (valid/invalid/risky/unknown), deliverability score, provider, company name, company type, country, SPF present, DMARC present, disposable flag, role-based flag, and a plain-English summary for each address.
What checks does Expetize run on each email?+
10+ checks per address: syntax validation, typo detection, DNS resolution, MX record check, SMTP mailbox probe, catch-all detection, SPF record lookup, DMARC record lookup, Spamhaus/SURBL blacklist check, disposable email detection (200+ providers), role-based address detection, and company intelligence lookup.
Do you have an API?+
An API is in development for Pro and Business plan users. It will support single-address verification and bulk submission.
Contact us if you need early API access or have a specific integration requirement.
What is an SPF record and why does it matter?+
SPF (Sender Policy Framework) is a DNS record that specifies which mail servers are authorized to send email on behalf of a domain. Domains without SPF records are more likely to have their emails marked as spam. We check for SPF presence as part of the domain reputation assessment.
What is a DMARC record?+
DMARC (Domain-based Message Authentication, Reporting & Conformance) builds on SPF and DKIM to tell receiving mail servers what to do with unauthenticated emails — reject them, quarantine them, or allow them. A published DMARC record is a strong signal of domain legitimacy and sender reputation.
What blacklists do you check against?+
We check the domain against Spamhaus DBL (Domain Block List) and SURBL — two of the most widely used real-time spam domain reputation databases. A domain appearing on these lists is a serious deliverability risk and will result in a Risky or Invalid status.