Email verification that runs before every send
Verify your list before every send — syntax, MX, SMTP and catch-all checks. Keep bounce rates under 2% automatically without third-party subscriptions.
No credit card required · Free unlimited warmup included · 250 free credits
Email verification checks whether an address can actually receive mail before you send to it, using syntax validation, MX record lookup, and SMTP handshake. AlienMail verifies your list inside the campaign workflow, so invalid addresses are removed before they can bounce and damage your sender reputation.
How it works
A modern, three-step pipeline engineered for inbox delivery and high conversion.
Upload & import lead lists
Import contacts via CSV or CRM. AlienMail automatically maps columns and formats names, company domains, and email fields.
Multi-stage validation engine
Every contact runs through syntax formatting, MX DNS lookups, live SMTP mailbox pings, and catch-all domain classification.
Filter invalid emails & send safely
Invalid emails and spam traps are filtered out automatically so your bounce rate stays safely below the critical 2% ISP threshold.
Why cold outreach requires pre-send verification
Internet service providers monitor hard bounce rates closely. When your bounce rate exceeds 2%, mailbox algorithms flag your domain as a spam source, routing subsequent valid emails straight to junk folders. Real-time pre-send verification ensures invalid addresses are suppressed before an email is ever dispatched.
Native workflow integration — no CSV ping-pong
Traditional verification tools force an inefficient cycle: export from CRM, upload to a third-party verifier, wait for processing, download cleaned CSV, and re-import. AlienMail embeds list verification directly into the campaign creation flow, saving hours of manual data handling every week.
Deep detection for catch-all, role, and disposable emails
Not all risky emails are hard bounces. Catch-all mailboxes accept all messages regardless of user existence, while role addresses (info@, sales@) hurt response rates. AlienMail flags these nuances clearly so you can choose your risk tolerance per campaign.
AlienMail vs Standalone Verification Services
Verified August 2026. Competitor pricing based on publicly listed pay-as-you-go tiers.
| Feature / Capability |  AlienMail | ZeroBounce | NeverBounce | Instantly |
|---|---|---|---|---|
| Workflow & Integration | ||||
| Built directly into outbound tool | ✓ Included | ✕ | ✕ | ✓ Included |
| Requires separate CSV export/import | No (Native) | Yes | Yes | No |
| Auto-suppression on campaign launch | ✓ Included | ✕ | ✕ | ✓ Included |
| Verification Capabilities | ||||
| Syntax & RFC format validation | ✓ Included | ✓ Included | ✓ Included | ✓ Included |
| MX record & domain DNS check | ✓ Included | ✓ Included | ✓ Included | ✓ Included |
| SMTP mailbox handshake ping | ✓ Included | ✓ Included | ✓ Included | ✓ Included |
| Catch-all domain identification | ✓ Included | ✓ Included | ✓ Included | ✓ Included |
| Disposable & temporary domain filter | ✓ Included | ✓ Included | ✓ Included | ✓ Included |
| Cost & Platform | ||||
| Monthly platform fee | $0 (Pay per send) | Credits only | Credits only | $47 / mo min |
| Cost per 10,000 verifications | Included in workflow | $65.00 | $80.00 | Add-on credits |
The 6-stage list validation pipeline
Every email address uploaded to AlienMail passes through six consecutive verification layers to eliminate deliverability risks and keep bounce rates under 2%.
Syntax & RFC Check
Validates proper formatting, standard character sets, correct '@' positioning, and detects common typos in domain extensions.
MX & DNS Lookup
Confirms that the recipient domain is active, correctly configured with valid Mail Exchange (MX) records, and able to receive inbound mail.
Disposable & Temp Filter
Detects and suppresses temporary inbox services, burner emails, and decaying ephemeral domains that cause sudden bounce spikes.
SMTP Handshake Ping
Opens a direct connection to the target mail server to verify that the specific mailbox exists without delivering a live message.
Catch-All & Honeypot Detection
Identifies catch-all servers, spam traps, honeypots, and toxic domains that silently drop emails or damage sender reputation.
Role Account & Risk Scoring
Flags non-personal role addresses (e.g. sales@, info@, support@) and assigns a composite confidence score before campaign launch.
Frequently Asked Questions
Everything you need to know about AlienMail features and deliverability.
What is email verification and why does it matter?
Email verification checks whether an email address exists and can accept messages without actually sending a live message. This prevents hard bounces, which protect your domain sender reputation from spam blacklists.
How does AlienMail verify email addresses?
AlienMail runs a 4-step pipeline: RFC syntax validation, domain MX record verification, SMTP mailbox handshake simulation, and catch-all / role-account detection.
What is a catch-all email and should I send to it?
A catch-all domain is configured to receive emails sent to any address on that domain, even if the mailbox does not exist. While some catch-all emails are valid, they carry a higher risk of bounce. AlienMail flags catch-all emails so you can decide whether to include them.
How much does email verification cost on AlienMail?
List syntax and MX validation is integrated directly into list uploads. Deep mailbox verification runs as part of your campaign workflow with zero monthly subscriptions.
Can I verify a bulk list from CSV?
Yes. You can upload CSV lead files with thousands of contacts, and AlienMail will automatically parse and validate the addresses before sequence activation.
What is an acceptable bounce rate for cold email outreach?
Industry best practice is to keep your hard bounce rate strictly below 2%. Anything over 3% puts your domain at immediate risk of ISP throttling and spam folder placement.
Will email verification catch every invalid address?
No verification tool can guarantee 100% detection because certain mail servers implement aggressive greylisting or disable SMTP verification responses. However, multi-stage validation catches the vast majority of dead addresses.
What is the difference between verification and validation?
Validation checks formatting (such as syntax and valid domain structure), while verification tests whether the specific mailbox actually exists on the recipient mail server via SMTP handshake.
Does verification detect role-based addresses like sales@ or info@?
Yes. AlienMail flags generic department addresses (support@, admin@, billing@) so you can prioritize named personal contacts for better cold outreach response rates.
Does verification work on international and custom domain extensions?
Yes, AlienMail validates all standard gTLDs, ccTLDs, and corporate private mail systems with active MX records.
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Transparent Pricing
Zero monthly commitments with native pre-send verification and unlimited inboxes.
Clean your list and protect your sender score
Stop burning domains on invalid leads. Upload your list and start launching verified cold email campaigns.