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Whitelisting TextBetter Email-to-Text Messages

This article explains how TextBetter sends Email-to-Text messages and the recommended way to whitelist them to ensure reliable delivery.

Overview

TextBetter’s Email-to-Text solution delivers inbound SMS messages to your email inbox using authenticated email delivery. In some environments, messages may be blocked or quarantined by enterprise email security platforms if allow rules are not configured correctly.

How Email-to-Text Messages Are Sent

When a text message is delivered to email:

  • Messages are sent from TextBetter-owned domains

  • Delivery uses enterprise-grade email infrastructure

  • Messages are authenticated using:

    • SPF

    • DKIM

    • DMARC

These controls verify message legitimacy and protect against spoofing or tampering.

Why IP or Wildcard Whitelisting Often Fails

Some organizations attempt to whitelist Email-to-Text messages using:

  • Wildcard rules (e.g. *.textbetter.com)

  • Static IP allow lists

These approaches are often unreliable because:

  • Email delivery platforms may use multiple or rotating IP addresses

  • Security tools prioritize authentication and sender reputation

  • Wildcards may not match the authenticated envelope domain

As a result, messages may still be blocked even when IP or wildcard rules are in place.

Recommended Whitelisting Method (Best Practice)

For reliable delivery, TextBetter recommends whitelisting based on domain identity and authentication, not IP addresses.

Allow Messages That Meet All of the Following

  • From domain: textbetter.com

  • Envelope / Return-Path domain: *.textbetter.com

  • Authentication results:

    • SPF = pass

    • DKIM = pass

    • DMARC = pass

  • Message type: Authenticated, non-spoofed transactional email

This aligns with how modern email security platforms evaluate trusted senders.

If IP Addresses Are Requested

IP-only whitelisting is not recommended, as IPs may change over time.

If IPs are required temporarily for troubleshooting:

  • Treat them as non-permanent

  • Still implement domain- and authentication-based allow rules for long-term reliability

Applies to Most Email Security Platforms

These recommendations apply to most enterprise email security solutions, including secure email gateways, cloud-based spam and phishing filters, and zero-trust email security platforms.

Need Help?

If messages continue to be blocked:

  1. Share this article with your IT or email security team

  2. Contact TextBetter Support at support@textbetterinc.com with:

    • A blocked message example (email headers preferred; please save as .EML)

    • The name of your email security platform

We’re happy to assist with validation or troubleshooting.