90%+ match rates · Deliverability verified
Email Appending Services
Your customer database has names, addresses, and purchase history - but no email addresses. That gap locks you out of email marketing, the channel that generates $36 for every $1 spent. Acelerar’s email appending specialists match your existing records against verified databases to add accurate, deliverability-checked email addresses so you can reach every customer digitally.
Email Appending
What is an email appending service?
Email appending is the process of matching your existing customer records - using name, postal address, and phone number as keys - against verified opt-in databases to find and add the correct email address. If your direct mail list has 50,000 customers but only 12,000 emails, email appending can fill in 35,000+ of those missing addresses. The result is a dramatically larger email marketing audience built from customers who already know your brand, driving higher open rates and conversion rates than purchased lists ever could.
Market Data
The outsourcing market
Businesses worldwide are outsourcing operations to improve efficiency and reduce costs.
What We Offer
Email appending solutions for every database
Consumer email appending
Most B2C databases are built from point-of-sale, loyalty programs, or direct mail - channels that capture names and addresses but rarely emails. We match your consumer records against permission-based databases covering 280+ million US consumers. Match rates typically range from 30-45% for consumer files, and every appended email is SMTP-verified to ensure deliverability before it reaches your marketing platform.
See data appending services →
B2B email appending
Business databases lose 30% of their email accuracy every year due to job changes and company turnover. We append direct business email addresses by matching company name, contact name, job title, and domain against commercial B2B databases and public business registries. B2B match rates average 40-60%, and we verify every email against the company’s mail server to confirm it is active and deliverable.
See data verification services →
Reverse email appending
Already have email addresses but missing names, postal addresses, or demographic data? Reverse email appending works backwards - we take your email list and match it against verified databases to append full name, mailing address, phone number, age, income, and other demographic attributes. This turns an email-only subscriber list into a rich customer profile database you can use for direct mail, segmentation, and personalized campaigns.
See data cleansing services →
Cost Savings
The real cost of in-house email enrichment
Hiring a data specialist to manually research and append emails in-house costs $34,000 to $42,000/year. With Acelerar, you get bulk email appending at a fraction.
$38K/yr
per year / per person
Salary · Benefits · Data source access · Verification tools
$11K/yr
per year / per person
85%+ match rate · CAN-SPAM compliant · Batch or ongoing
Why Choose Acelerar
Why businesses choose Acelerar for email appending
90%+ Deliverability Rate
Every appended email address is SMTP-verified and checked against known spam traps, hard bounces, and disposable email providers before delivery. You only pay for emails that work.
Permission-Based Sources Only
We source from opt-in databases only - never scraped, harvested, or illegally obtained data. Every email we append comes from a consumer or business that has opted into commercial communications.
GDPR & CAN-SPAM Compliant
All appending follows GDPR, CAN-SPAM, and CCPA regulations. We provide compliance documentation, honor suppression lists, and maintain data processing agreements for every project.
Pay-Per-Match Pricing
You only pay for records we successfully match and verify. No upfront fees for unmatched records. A typical 25,000-record consumer append runs $500-$1,500 depending on match rate and verification level.
3-5 Day Turnaround
Standard email appending projects (up to 100,000 records) are delivered within 3-5 business days including full verification. Rush delivery available for campaign-critical deadlines.
Platform-Ready Delivery
Appended data is formatted for direct import into Mailchimp, Klaviyo, HubSpot, Salesforce, or any ESP you use. We handle field mapping, deduplication, and suppression list integration.
How It Works
From incomplete database to full email coverage in 4 steps
Upload Your File
Send your customer database in CSV, Excel, or direct CRM export. We need name and at least one additional field (postal address, phone, or company) as matching keys.
Match & Append
Our team matches your records against verified opt-in email databases using deterministic matching algorithms. We prioritize accuracy over volume - no probabilistic guessing.
Verify & Validate
Every appended email is SMTP-verified for deliverability, checked against known spam traps and bounce lists, and screened against your existing suppression file.
Deliver & Report
Receive your appended file in your preferred format with a detailed match rate report, deliverability scores, and compliance documentation ready for your records.
Missing emails limiting your marketing reach?
Send us a sample of your database and we’ll run a free match rate analysis - you’ll see exactly how many email addresses we can append before you commit to a full project.
Get a Free Match AnalysisWe work with your tools
Our teams are trained on the platforms you already use.
What our clients say
“The Acelerar team is a self-sustaining machine. They’ve become an extension of our own team.”
“Acelerar handled our entire catalog migration (50,000+ SKUs) without a single missed deadline.”
“We needed reliable, fast data entry at scale. Acelerar delivered consistent quality from day one, no ramp-up time needed.”
Industry Outlook
Where outsourcing is heading
The outsourcing industry continues to grow with AI adoption driving new capabilities.