Summary
Google Postmaster Tools aggregates data for both domains and subdomains, offering a comprehensive view. While subdomain data contributes to the root domain's overall picture, it is essential to monitor subdomains separately for granular insights. The deliverability and sending reputation of subdomains directly affect the root domain's reputation, especially with shared IPs. Good sending practices, proper authentication (SPF, DKIM, DMARC), and proactive warming up are crucial. Compromised subdomains can severely impact the root domain. Google Postmaster data has a typical delay of approximately two days. Sender reputation affects if email will be allowed, blocked or filtered. Isolate sending reputation per subdomain so there are no issues with the overall reputation.
Key findings
- Data Aggregation: Google Postmaster Tools aggregates data for domains and subdomains, offering a comprehensive overview.
- Reputation Influence: Subdomain deliverability and sending practices impact the overall domain reputation.
- Separate Monitoring: Monitoring subdomains separately is crucial for identifying specific deliverability issues.
- Authentication Matters: Proper email authentication (SPF, DKIM, DMARC) on subdomains improves overall deliverability and protects reputation.
- GPT Delay: Google Postmaster Tools data typically has a two-day delay.
Key considerations
- Sending Practices: Maintain good sending practices across all subdomains.
- Subdomain Security: Secure subdomains to prevent spam sending and protect the root domain's reputation.
- Warming Up: Warm up new subdomains before sending large volumes of email.
- Proactive Monitoring: Monitor subdomains regularly and address deliverability issues promptly.
- Account for data delay: Account for the 2 day delay in data reporting to ensure that informed decisions are being made.
- Isolate sending reputation: Isolate sending reputation per subdomain so there are no issues with the overall reputation.
What email marketers say
13 marketer opinions
The consensus is that subdomain data does, in fact, contribute to the root domain's data within Google Postmaster Tools. While direct roll-up behavior is observed, separate subdomain monitoring remains vital for spotting granular issues and upholding a healthy sending reputation for the entire domain. Factors such as subdomain sending volumes, reputation inheritance, and authentication methods all play crucial roles. Compromised subdomains sending spam can negatively impact the entire domain's reputation.
Key opinions
- Data Contribution: Subdomain data contributes to the overall data presented for the root domain in Google Postmaster Tools.
- Reputation Influence: The sending reputation of subdomains can influence the reputation of the root domain.
- Granular Monitoring: Monitoring subdomains separately is crucial for identifying specific deliverability issues.
- Authentication Importance: Proper authentication (SPF, DKIM, DMARC) on all subdomains helps improve overall deliverability and domain reputation.
Key considerations
- Sending Practices: Maintain consistent and good sending practices across all subdomains to protect the root domain's reputation.
- Compromised Subdomains: Secure all subdomains to prevent spam sending and avoid negative impact on the overall domain.
- Warming Up Subdomains: Warm up new subdomains gradually to establish a positive reputation before sending large email volumes.
- Prompt Issue Resolution: Address deliverability issues on subdomains promptly to prevent them from affecting the root domain.
Marketer view
Email marketer from Quora shares that the data from subdomains does contribute to the overall picture presented in Google Postmaster Tools for the main domain. Actively monitoring both the main domain and subdomains will provide the best overview.
21 Apr 2024 - Quora
Marketer view
Email marketer from EmailOnAcid Community Forum shares that generally, the reputation of subdomains can influence the overall reputation of the root domain in Google Postmaster Tools. The extent of the influence depends on factors like sending volume and consistency across subdomains.
27 Sep 2022 - EmailOnAcid Community Forum
What the experts say
3 expert opinions
The data presented in Google Postmaster Tools for subdomains can impact the overall domain reputation. Deliverability issues on subdomains, particularly with shared IPs, can negatively affect the root domain. Google Postmaster Tools data also has a delay of approximately two days.
Key opinions
- GPT Data Delay: Google Postmaster Tools data has a typical delay of about two days.
- Subdomain Impact: Subdomain deliverability affects overall domain reputation.
- Reputation Isolation: It's important to isolate sending reputation per subdomain.
Key considerations
- Monitor Subdomains: Regularly monitor the sending practices and deliverability of subdomains.
- Address Poor Practices: Address any poor sending practices on subdomains to avoid impacting the root domain.
- Isolate Subdomain Reputation: Implement measures to isolate the sending reputation of each subdomain.
- Account for data delay: Account for the 2 day delay in data reporting to ensure that informed decisions are being made.
Expert view
Expert from Email Geeks says that Google Postmaster Tools data is typically 2 days behind the current date, and it'll take a couple of days before you see anything show, assuming you meet the other criteria like minimum volume, DKIM, and Domain verification.
8 Oct 2022 - Email Geeks
Expert view
Expert from Word to the Wise details how subdomains used for sending can impact a domain's overall reputation, especially if the IP address is shared. It's more important to isolate sending reputation per subdomain so there are no issues with the overall reputation.
16 Jun 2022 - Word to the Wise
What the documentation says
5 technical articles
Google Postmaster Tools aggregates data for both domains and subdomains, providing a comprehensive overview of performance at the domain level. While subdomains can aid in isolating reputation issues, Google Postmaster Tools often prioritizes the overall domain reputation. Poor subdomain performance can negatively impact the root domain's deliverability. Sender reputation is a calculated value used to determine the quality of email servers. SPF records are crucial for specifying authorized mail servers and preventing email spoofing, contributing to domain health. Implementing DMARC on both the root domain and subdomains enhances protection against email spoofing and improves deliverability, positively impacting overall reputation.
Key findings
- Data Aggregation: Google Postmaster Tools aggregates data for domains and their subdomains.
- Overall Reputation: Google Postmaster Tools often treats overall domain reputation as a primary factor.
- SPF Importance: SPF records are crucial for specifying authorized mail servers and preventing email spoofing.
- DMARC Implementation: Implementing DMARC enhances protection against email spoofing and improves deliverability.
- Sender Reputation: Sender reputation is a calculated value to determine quality of email servers.
Key considerations
- Monitor Subdomain Performance: Monitor subdomain performance to prevent negative impacts on the root domain's deliverability.
- Implement SPF: Implement SPF records to authorize mail servers and prevent email spoofing.
- Implement DMARC: Implement DMARC on both root domains and subdomains to enhance protection against email spoofing and improve deliverability.
Technical article
Documentation from Microsoft explains that Sender reputation is the calculated value that Microsoft uses to determine the quality of sending email servers. This value is used to decide whether to allow email, block it, or filter it.
5 Feb 2022 - Microsoft Support
Technical article
Documentation from Google Support explains that Google Postmaster Tools aggregates data for domains and subdomains. It clarifies that data shown at the domain level includes the performance of all subdomains associated with that domain, providing a comprehensive overview.
3 Jun 2024 - Google Support
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