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Why is Gmail throttling my IP warming emails and the IP reputation dashboard not updating?

Matthew Whittaker profile picture
Matthew Whittaker
Co-founder & CTO, Suped
Published 5 Aug 2025
Updated 17 Aug 2025
5 min read
You are IP warming a new sending infrastructure, meticulously increasing your email volume day by day, and closely monitoring Google Postmaster Tools. Then, frustration sets in. Gmail starts throttling your sends, even at low volumes, and the IP reputation dashboard in Postmaster Tools mysteriously stops updating. What is happening?
This scenario is surprisingly common and can be incredibly confusing. You are doing everything by the book, yet your emails are facing delays or being rejected, and you lack clear data from Gmail to understand why. It leaves you questioning if your warming efforts are even being registered by the internet service providers (ISPs).
IP warming is a critical process for new or dormant IP addresses to establish a positive sender reputation. When Gmail pushes back through throttling, it signals that something is amiss, often related to how your mail is perceived, rather than just the volume you are sending.

Why Gmail throttles during IP warming

Gmail's throttling mechanism is highly sensitive to early sending behavior. If the initial volume is too high or the recipient engagement is unexpectedly low, their filters quickly react to protect their users, classifying the mail as potentially unwanted or even spam. This can happen even with seemingly engaged lists if the initial volume presents a sudden, sharp spike.
Mailbox providers, including Google, prioritize user experience. If your emails trigger spam complaints, even a small percentage, or if recipients delete without opening, it negatively impacts your reputation. It is a common misconception that 0.0% spam complaints in Postmaster Tools means no issues, as data for low volumes may not be sufficient for accurate reporting. For more details on throttling, you can review common reasons for temporary rate limiting from Gmail on Reddit.
Authentication plays a critical role. Even if your initial volume is low, a lack of proper email authentication, such as correctly configured SPF, DKIM, and DMARC records, can lead to immediate throttling. Gmail and Yahoo now have stringent requirements that penalize senders with misaligned or missing authentication.

The mystery of the stagnant IP reputation dashboard

It is a common concern when your IP reputation dashboard in Google Postmaster Tools is not updating, especially when other metrics like domain reputation are. This often indicates that the volume of email sent from that specific IP address to Gmail recipients is too low for Postmaster Tools to gather sufficient data.
The IP reputation data in Postmaster Tools tends to lag behind real-time sending behavior and often requires a certain threshold of volume to become active or update consistently. If your sending volume is very low, or if the majority of your mail is not reaching the inbox due to throttling, there simply is not enough data for the tool to display a meaningful reputation score.
It is important to understand that IP and domain reputation can be affected differently. While your domain reputation might improve due to positive engagement signals on specific campaigns or a longer history, a new or troubled IP needs a sustained period of good sending practices at sufficient volume to reflect positively in the dashboard. This is often why your Postmaster Tools data is not updating.

Common causes of failed IP warming and throttling

Beyond authentication, several factors can derail your IP warming efforts and lead to throttling. These often revolve around how your mail is perceived by recipients and Gmail's filters.

The problem

  1. Initial volume too high: Sending thousands of emails from a new IP on day one.
  2. Poor engagement: Mailing unengaged lists or purchasing old data.
  3. Content issues: Sending overly promotional, spammy, or irrelevant content.
  4. Incorrect list segmentation: Not prioritizing the most active subscribers during warming.

The solution

  1. Start small: Begin with very low volumes, gradually increasing over weeks.
  2. Engaged lists first: Only send to your most active and opted-in subscribers initially.
  3. Optimize content: Ensure your emails are valuable, personal, and expected.
  4. Segment intelligently: Use specific engagement criteria, such as recent opens or clicks, to refine your warming list.
Another overlooked aspect is the quality of your recipient list. Even if you believe your list is “very engaged” because they have “opened and clicked,” Gmail considers various signals. If recipients are marking your mail as spam, even after opening, it severely damages your sender reputation, making it difficult for your emails to land in the inbox.

Strategies for successful IP warming and reputation building

To overcome throttling and ensure your IP reputation dashboard reflects your efforts, a strategic and patient approach is essential. It is not just about sending volume, but about the quality of that volume and how recipients react.

Best practices for IP warming

  1. Implement a strict warm-up schedule: Gradually increase volume over several weeks, focusing on steady, consistent sending.
  2. Hyper-segment your audience: Begin by sending only to your most active and engaged subscribers.
  3. Monitor engagement metrics: Track open rates, click-through rates, and especially spam complaint rates.
  4. Ensure flawless authentication: Verify that your SPF, DKIM, and DMARC records are correctly set up and aligned.
  5. Diversify content: Use a mix of transactional, informational, and promotional content if applicable, prioritizing highly anticipated messages.
If you are experiencing throttling or reputation issues, consider reviewing your list hygiene. Remove inactive subscribers and address any soft bounces. Maintaining a clean list and verifying email addresses helps prevent your emails from hitting spam traps or generating high bounce rates, which can trigger blocklists (or blacklists) and harm your sender reputation. For instance, understanding how your domain reputation changes can offer valuable insights.

Views from the trenches

Best practices
Ensure all email authentication records, including SPF, DKIM, and DMARC, are correctly configured.
Prioritize sending to highly engaged segments of your audience during the warm-up period.
Regularly review content to ensure it aligns with recipient expectations and minimizes spam complaints.
Utilize double opt-in for all new subscribers to build a clean and responsive list.
Common pitfalls
Starting with excessively high email volumes on a new or cold IP address.
Relying solely on "offline" engagement data without considering real-time email interactions.
Ignoring minor throttling signals, which can escalate into more severe deliverability issues.
Misinterpreting low spam complaint rates in Postmaster Tools for very low sending volumes.
Expert tips
Thoroughly clean your email lists to remove inactive or problematic addresses before starting IP warming.
Consider the user's explicit interaction with your emails as the primary engagement metric for ISPs.
If possible, slowly introduce new content types after initial warming success.
Remember that even engaged users might mark emails as spam, which ISPs track.
Marketer view
Marketer from Email Geeks says: DMARC and associated authentication errors will lead to throttling at Gmail, regardless of the sending volume, so proper alignment of these records is crucial.
September 27, 2024 - Email Geeks
Expert view
Expert from Email Geeks says: If there is a content issue, it indicates users have reacted negatively to the mail, so trying different content is advisable.
September 27, 2024 - Email Geeks

Summary

Navigating Gmail's throttling and the nuances of Postmaster Tools during IP warming can be challenging. The key is to understand that Gmail's algorithms prioritize recipient experience and robust authentication above all else.
When your IP reputation dashboard is not updating, it often points to low sending volume to Gmail or significant deliverability hurdles, such as content issues or negative recipient reactions, even if overt spam complaints are not visible. Patiently building a positive sender reputation through consistent, high-quality engagement with meticulously cleaned lists is paramount to improve email deliverability.

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