Based on this report, we recommend:
To verify your custom domain for Gmail (Google Workspace) Hotmail/Outlook (Microsoft 365) Yahoo Mail , you must add specific TXT records to your domain's DNS settings
While CSV and Excel files are popular, data professionals prefer the plain text ( .txt ) format for handling raw email lists. Minimal File Size
Enabling verified text services is a straightforward yet effective way to bolster the security of your Gmail, Hotmail, and Yahoo accounts. In an era where digital threats are increasingly common, taking proactive steps to protect your online presence is more important than ever. Take a moment to secure your accounts today and enjoy the added peace of mind that comes with knowing your digital communications are protected.
The Ultimate Guide to Gmail, Hotmail, and Yahoo TXT Verified Emails (2026)
A cryptographic signature that proves the email content has not been tampered with in transit.
Accounts that are closed, deleted, misspelled, or non-existent. These must be permanently purged from your databases.
Generate a DKIM key in your email provider's admin console, then add it to your DNS. TXT Host: selector._domainkey
Once your list is properly structured as one email address per line in a .txt or .csv file, upload it to a reputable bulk email verification platform. Top-tier tools include: ZeroBounce NeverBounce NeverBounce Step 3: Understand the Verification Results