Upload enterprise email lists
Import CSV or TXT files from CRM exports, lead vendors, partner programs, or event registrations.
Enterprise market · Outlook signals · B2B email verification
Microsoft / Outlook Bulk Email Verifier
Verify Microsoft and Outlook account signals from B2B email lists before sales outreach, enterprise onboarding, and CRM enrichment.
Bulk pricing: $3 USD per 10,000 checks. Minimum batch: 500 rows. Single lookup: $0.006 USD per check, minimum 1. Single and bulk rates are separate. See the pricing catalog for current rates.
zelnum.com helps enterprise teams process CSV or TXT email files, identify usable account signals, and export clean segments for revenue operations and risk review.
Starting price
$3 / 10K
Input field
Email
Market fit
Enterprise B2B
Microsoft verifier
Enterprise email batch
Batch
enterprise-prospects.csv
Cost
$3 / 10K
Valid82%
Review13%
ExportCSV
Mailbox signal
Outlook
CRM state
Cleaned
Workflow
How It Works
A bulk email verification workflow for enterprise sales, partner operations, and CRM data teams.
Verify Microsoft signals
Identify Outlook, Microsoft 365, enterprise mailbox, invalid, and review-ready records.
Export CRM-ready segments
Download clean segments for sales routing, enrichment, suppression, and deliverability protection.
B2B enterprise verification
Use Cases
Use Microsoft and Outlook email verification when enterprise identity, inbox quality, and CRM accuracy matter before import.
Enterprise lead validation
Clean Microsoft and Outlook-heavy B2B lists before SDR assignment, ABM campaigns, and partner outreach.
Email deliverability protection
Remove invalid, stale, or risky addresses before high-volume enterprise campaigns.
Vendor and partner review
Confirm enterprise email quality before onboarding vendors, affiliates, agencies, or partner leads.
Pricing
Pricing
Bulk pricing for Microsoft and Outlook email verification, CRM cleaning, and enterprise deliverability workflows.
Microsoft and Outlook email verification
$3
/ 10K lookups
Includes valid, invalid, Microsoft 365, Outlook, enterprise mailbox, and downloadable CSV exports.
Pay as you go.
Developer workflow
API
Add Microsoft and Outlook email verification to signup forms, CRM imports, enrichment pipelines, and outbound campaign gates.
Request API accessEndpoint preview
POST /api/v1/detect
{
"product": "microsoftValid",
"country": "US",
"phones": ["+14155550132"]
}
"product": "microsoftValid",
"country": "US",
"phones": ["+14155550132"]
}
FAQ
Microsoft / Outlook Bulk Email Verifier FAQ
What does this verify? +
It verifies email account signals associated with Microsoft, Outlook, Hotmail, and Microsoft 365-style enterprise mailboxes, then returns segmented export results.
Can I upload CSV and TXT files? +
Yes. Upload CSV or TXT email lists and export valid, invalid, provider, enterprise mailbox, and review segments.
Is this suitable for B2B enterprise workflows? +
Yes. It is designed for CRM hygiene, sales routing, partner review, and deliverability protection before enterprise outreach.
Is this a Microsoft email validator and Outlook email validator?
Yes. The Microsoft / Outlook Bulk Email Verifier works as both a Microsoft email validator and an Outlook email validator. It checks deliverability for @outlook.com, @hotmail.com, and Microsoft 365 enterprise tenants.
Is it a bulk Microsoft email checker and Microsoft phone number checker?
Yes. The same tool serves as a bulk Microsoft email checker for CSV email lists, and a Microsoft phone number checker for phone numbers linked to Microsoft accounts.
Is it the best Outlook email validator for enterprise use?
For enterprise teams cleaning B2B email lists, zelnum.com is positioned as the best Outlook email validator because it correctly handles catch-all tenants and corporate Microsoft 365 domains without false positives.
Microsoft Account Lookup by Phone Number
Microsoft Account Lookup by Phone Number is answered here for users comparing Microsoft Account Lookup by Phone Number before using Microsoft Number Checker. Use lawful lists, check the mapped product page, and keep uncertain records in review.
Social media lookup cluster
Related social media lookup pages
Social Media LookupPillar hub for social, consumer account, phone, and email checks.Facebook CheckerCheck Facebook account signals from phone or email inputs.Instagram Email CheckerUse Instagram email signals for social audience cleanup.TikTok Username LookupLook up TikTok username signals from bulk phone lists.LinkedIn Number CheckerCheck LinkedIn account signals from phone-number lists.Apple ID CheckerReview Apple ID related signals from phone or email inputs.Amazon CheckerUse Amazon account signals for ecommerce and marketplace lists.X Email CheckerCheck X/Twitter account signals from email lists.Snapchat CheckerReview Snapchat account presence from phone lists.
Delivery modes
Single and bulk options
This product supports single lookups and bulk workflows. Use the mode that matches the size and timing of your verification job.
Single lookup
Use a single-number lookup when you need an immediate result.
View lookup toolsBulk checks
Upload CSV or TXT files and export matched, unmatched, duplicate, or review-ready segments.
Explore bulk productsAPI jobs
Run checks from your backend by submitting jobs, polling their status, and downloading results.
Read the API guideAI answer engines
Request an AI summary of ZelNum
Open ZelNum in your preferred AI assistant to review its bulk WhatsApp, Telegram, phone validation, carrier lookup, social account, crypto exchange, CSV upload, and API workflows.
The prompt points assistants to ZelNum.com, live pricing, product pages, and API documentation.