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Gmail Domain Configuration Guide

1. Register Account​

Simply log in with your Google account to access:

Gmail Postmaster Tools

2. Add Sending Domain​

  • Click the red + button in the bottom right corner and fill out the form

Add Domain

💡 Note: Enter the sending domain here, not the sender address. For example:

  • Sender address: support@mail.uspeedo.ai
  • Sending domain: mail.uspeedo.ai

Domain Verification

In the second step, you will see the TXT record, or you can click the red text "Adding a CNAME record" to get the CNAME record. Choose either one.

3. Configure Domain DNS​

Once you have the TXT record or CNAME record, you can configure DNS. TXT records can be added multiple times.

Steps:

  1. Log in to the platform where you purchased your sending domain, find the domain resolution or DNS resolution page, and add the resolution record

DNS Configuration

  1. Host Configuration:

    • If the sending domain is: team.uspeedo.ai, the Host should be: team
    • 【Not recommended】If the sending domain is: uspeedo.ai, the Host should be: @

  2. After successful resolution, refresh the page after 3-5 minutes to see the status change to: Verified

Verified

4. View Domain/IP Reputation​

Viewing reputation requires some time to accumulate (at least 7 days). If you haven't sent any emails, there will be basically no data, and it will default to a new domain that needs warm-up.

Reputation View

Spam Rate​

  • Definition: The proportion of emails marked as spam by users
  • Gmail is particularly sensitive: > 0.1% starts to pose a risk
    • 0.3% will significantly affect inbox delivery rate
  • What to monitor:
    • Spam Complaint Rate
    • Spam rate in Gmail Postmaster Tools

Spam Rate

IP Reputation​

  • Definition: The overall credibility of the sending IP on the email service provider (ISP) side
  • Mainly reflects: Short-term sending behavior quality
    • New IPs or unwarmed IPs have higher risks
    • Sudden increases in sending volume will quickly lower reputation
  • What to monitor:
    • IP Reputation level (High / Medium / Low / Bad)
    • Whether it's on a blacklist (RBL)
    • Sending volume changes per unit time (whether there's a Burst)

Domain Reputation​

  • Definition: The long-term reputation performance of the sending domain on the ISP side
  • Gmail prefers: Using the domain as the core judgment object
    • When domain reputation is poor, changing IPs has limited effect
  • What to monitor:
    • Domain Reputation level (High / Medium / Low / Bad)
    • Overall delivery performance of all emails under the same domain
    • Domain reputation in Gmail Postmaster Tools

Feedback Loop (FBL)​

  • Definition: ISPs provide feedback to senders about users' spam complaint behavior
  • Used to identify: Recipients who clearly dislike the emails
    • Gmail does not provide traditional FBL
    • Yahoo / Outlook support it
  • What to monitor:
    • Email addresses of complaining users
    • ISP source of complaints
    • Time when complaints occurred
  • Best practices:
    • Immediately add users who complain to the unsubscribe or blacklist

Authentication​

  • Definition: Verifies whether emails come from legitimate and trusted senders
  • Gmail's basic delivery threshold:
    • Authentication failures are very likely to end up in spam or be rejected
  • What to monitor:
    • SPF: Whether it passes (Pass / Fail)
    • DKIM: Whether it passes (Pass / Fail)
    • DMARC: Whether it passes and whether it's aligned (Alignment)

Encryption​

  • Definition: Whether emails use encrypted channels during transmission
  • A reputation bonus rather than a deciding factor:
    • Long-term TLS maintenance is beneficial for overall reputation
  • What to monitor:
    • TLS encryption usage rate
    • Whether there are cases of encryption failure falling back to plaintext

Delivery Errors​

  • Definition: Cases where emails fail or are delayed during delivery
  • Directly reflects: Recipient data quality and sending behavior
    • High error rates will affect reputation assessment
  • What to monitor:
    • Hard Bounce (Permanent failure, such as non-existent email addresses)
    • Soft Bounce (Temporary failure, such as rate limiting, server busy)
    • Distribution of 4xx / 5xx error codes

5. [Optional] Add US Access Permission​

You can view this directly on the US platform later to optimize email delivery effectiveness.

Steps:

  1. After successful resolution, hover over the corresponding domain, click the action on the right, and select Manage Users

  2. Click + in the bottom right corner, and add the email: uspeedocom@gmail.com

Add User