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Email Masking - Domain Reputation and Deliverability


Overview

When using a masked email address to send from your own domain, deliverability doesn't just depend on the content of your email - it also depends on the reputation of your domain.

Email providers like Gmail, Outlook, and Yahoo track how your domain behaves over time. A good reputation improves your inbox placement. A poor one can land you in spam, or even block your emails entirely.

What is Domain Reputation?

Your domain reputation is like a credit score for email. It's based on how trustworthy and consistent your domain has been when sending emails over time.

Email providers monitor:

  • How often your emails are opened or clicked
  • How many are deleted without being opened
  • If users report your messages as spam
  • Whether your domain has been used for spam or phishing in the past
  • Technical settings like SPF, DKIM, and DMARC

Why It Matters for Masked Sending

When you use email masking, you're asking platforms like Gmail to trust that you're legitimately sending from your domain - even though the technical sender is a third party (our platform, via AWS SES).

If your domain doesn't already have a good reputation, or is brand new, it may take time to build trust. Sending too much too soon from a fresh domain can hurt your standing from the start.

Use a Domain That's Already Established

🆕 Less than 1 month
Risk Level: High risk
Recommendation: Avoid using brand-new domains unless absolutely necessary

🟡 1 to 6 months
Risk Level: Moderate
Recommendation: Use with caution, send slowly and build up over time

✅ 6+ months
Risk Level: Low risk
Recommendation: Best option, especially if the domain has a history of legitimate use

How to Build and Protect Domain Reputation

Tip / Why It Helps

  • 📬 Start small — Send a small batch of emails first, then gradually increase volume
  • 📊 Monitor engagement — Focus on sending emails people open and interact with
  • 🧹 Keep your list clean — Avoid sending to invalid or unengaged addresses
  • 🚫 Avoid spammy content — Don't use misleading subject lines, overuse images, or use too many salesy keywords
  • 📧 Use real reply-to addresses — Don't hide behind no-reply - it lowers trust
  • 🧪 Test your emails — Send test messages to yourself and check where they land (inbox vs spam)
  • 🔄 Keep a consistent sending schedule — Avoid large, unpredictable spikes in activity

Tools to Check Your Domain Reputation

While reputation scores aren't always publicly visible, here are some tools that can help:

  • Google Postmaster Tools – Great for Gmail deliverability insights
  • MXToolbox – Useful for DNS checks and blacklists
  • Talos (by Cisco) – Shows general domain reputation status

Summary

Action / Result

  • 'úÖ Use a domain with some history — More likely to be trusted by inbox providers
  • 'úÖ Build slowly with clean content — Helps you avoid spam folders and throttling
  • 'ùå Send bulk emails from a brand-new domain — Likely to get blocked or flagged
  • 'ùå Ignore engagement rates and complaints — Hurts your future deliverability

A strong domain reputation takes time to earn but pays off with better inbox placement and higher open rates. If you're setting up email masking, we strongly recommend using a domain with some history and following best practices to protect its reputation.