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Gain Confidence in Your First-Party Data to Engage Across Digital Channels

SafeToSend leads the industry in accuracy, security, speed, and ease of use to provide comprehensive email data hygiene and protection against costly problematic addresses. Inaccurate or decayed data, bouncing emails, spamtrap hits, and potential for damaged reputation are just a few reasons to utilize SafeToSend for email address validation.

SafeToSend emails are 100% guaranteed safe, deliverable addresses to drive higher engagement rates. Continuously improved for over 20 years with billions processed, there’s no better choice for your data quality needs.

Recent Innovations

Addition of
Engagement Score

Email addresses are scored based on engagement and activity signals to identify actively used emails for improved deliverability, better segmentation, and qualifying leads.

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Reduction in Email Validation Unknown Rates

Utilizing machine learning models, SafeToSend now has even more complete fill rates so companies can forge stronger connections with their hard-earned customer base.

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Improved Dangerous Domain Detection

Advanced methods to more rapidly identify abnormal behavior across billions of activity signals to prevent deployment to risky addresses and protect data integrity.

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Confirm the address is valid and able to accept email using proprietary algorithms and knowledgebase.

  • Syntax conforms to RFC and AtData standards.
  • Domain and MX record are valid and accept mail.
  • Address meets ISP-specific requirements.
  • Verify account is linked to a working mailbox. (Our process includes recent email deliverability findings and real-time SMTP check)


Fix typos, formatting, syntax and other input errors with our patented “spell-check” technology.

  • Misplaced or transposed @ signs and invalid characters such as spaces or quotes.
  • Typos in both TLD’s (.com, .net, .edu, etc.) and LLD’s (gmail, aol, Hotmail, etc.)
  • Any misspelled domain or uncommon domain entries beyond just the common, popular ones.
  • AtData has analyzed billions of email address registrations and can identify and correct the vast majority of inadvertent errors.


We weed out damaging, but often deliverable, addresses to alleviate risk and save reputation.

  • Toxic addresses such as known and suspected spamtraps and honeypots.
  • High-risk and dangerous email domains.
  • Undesirable targets such as spam complainers, role accounts, disposable domains, fictitious and malicious email addresses, and client specific suppressions.
  • Those that fall outside of best-practices like DMA “Do Not Email List” and FCC wireless domains.


Know that your emails are validated, corrected, and safe so your messaging gets to the right audience.

  • All results are 100% guaranteed deliverable.
  • Engagement score identifies how active an email address is based on recency, quantity, type, and sources of activity from billions of email opens, website visits, and other usage signals.
  • Drive higher engagement rates with validated data.

Getting Started is Easy

We make it simple to clean your data through our self-service portal, InstantData. Create a free account and either select your email list from your local device, upload it via FTP or import it from your email marketing platform. We have many integrations with more to come.

Visualize Your Data

Our easy-to-use dashboard gives you a high-level overview of your data quality. Quickly review the status breakdown of your email addresses, the types of domains on your list, how many typos we detected and corrected and the quantity of role accounts you should watch out for.

Detailed Response Codes

Our 35+ response codes provide in-depth insights into your data quality and highlight ways you can improve your data collection practices. InstantData, our self-service platform, provides both summary reports and appends our analysis to each email on your list.

Real-Time API

With our API, you can avoid lost leads and improve data quality by validating email addresses in real-time as they are entered on your web forms or collected in your stores. You can submit files via our API as well and track your usage and results directly via the InstantData dashboard.

SMTP and proprietary mailbox verification

Syntax and typo correction

Enhanced B2B email verification

Advanced SpamTrap detection

Custom filtering

Dedicated email address experts

Access to ESP and data platform integrations

100% Deliverability Guarantee

Continue to Get the Most Out of Your First-Party Data

List Guard®

Protect your data from traps and decay with ongoing monitoring

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Email Opener Data

Find out which of your email addresses are in-use and responsive

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Additional Resources

Talk with an Email Expert