To set up Gmail Postmaster Tools for a domain with subdomains effectively, a multi-faceted approach is required. Firstly, add both the parent domain and all subdomains separately to Gmail Postmaster Tools by navigating to the platform, clicking the '+' sign, and verifying domain ownership using a DNS TXT record for each. While authenticating the sending domain (often the subdomain) via SPF or DKIM is crucial, prioritize setting up authentication for the registered domain in the 'd=' tag. This comprehensive approach offers visibility of all traffic under the parent domain and allows for clear separation of subdomains. This also ensures granular monitoring of each subdomain's reputation, enabling the isolation of deliverability issues specific to different email streams (e.g., transactional vs. marketing). Properly authenticating subdomains with SPF, DKIM, and DMARC is vital for building trust with Gmail. Furthermore, gradually warm up new subdomains by starting with low sending volumes and gradually increasing over time. Regularly monitor both the domain and subdomain reputation within Postmaster Tools to identify and resolve problems efficiently. Lastly, adherence to Gmail’s bulk sender guidelines, including authentication and consistent monitoring, is essential for maintaining a positive sender reputation and preventing deliverability problems.
7 marketer opinions
To effectively set up Gmail Postmaster Tools for a domain with subdomains, the prevailing advice is to add both the parent domain and each subdomain separately for granular monitoring. This enables isolation of reputation issues related to specific email streams (e.g., transactional vs. marketing). Authenticating subdomains with SPF, DKIM, and DMARC is crucial for building trust. Separating traffic types provides clearer insights. Gradual IP and volume warm-up for new subdomains is recommended, along with verifying subdomain ownership via DNS records. Monitoring both domain and subdomain reputation helps identify and resolve deliverability problems.
Marketer view
Email marketer from Email Geeks suggests adding both the parent domain and subdomain to Postmaster.
14 Feb 2024 - Email Geeks
Marketer view
Email marketer from Reddit shares that when using subdomains, it's useful to separate transactional email traffic from marketing email traffic. This can provide data on where issues are arising.
30 Aug 2021 - Reddit
7 expert opinions
Setting up Gmail Postmaster Tools for domains with subdomains involves authenticating the sending domain via SPF or DKIM, often the subdomain. Prioritize authentication for the registered domain in the 'd=' tag before adding subdomains. This allows viewing all traffic under the parent domain and separating subdomains. Adding each subdomain individually to Postmaster Tools is crucial for granular monitoring of reputation and identifying deliverability issues. GPT assumes authorization for the parent domain extends to subdomains. Verify and monitor each subdomain separately, especially when using different email streams, for precise tracking of reputation metrics.
Expert view
Expert from Spam Resource emphasizes the importance of adding each subdomain individually to Gmail Postmaster Tools to accurately monitor the reputation of each sending domain and identify specific issues affecting deliverability. This provides a granular view essential for troubleshooting.
17 Sep 2022 - Spam Resource
Expert view
Expert from Email Geeks believes it should be the domain you authenticate with via SPF or DKIM, likely the m. domain.
28 Sep 2021 - Email Geeks
4 technical articles
Setting up Gmail Postmaster Tools for domains with subdomains involves adding each domain/subdomain separately by navigating to Postmaster Tools, clicking the plus sign, entering the domain name, and verifying ownership using a DNS TXT record. Postmaster Tools provides key insights into sending reputation, spam rates, and other metrics crucial for identifying and resolving deliverability issues. Following Gmail's bulk sender guidelines, including setting up authentication (SPF, DKIM, DMARC) and diligently monitoring Postmaster Tools, is essential for maintaining a positive sender reputation and preventing deliverability problems.
Technical article
Documentation from EasyDMARC explains that the subdomain should be added to the Postmaster Tools separately to allow for monitoring of subdomain reputation.
9 Sep 2021 - EasyDMARC
Technical article
Documentation from Google Support explains that to add a domain, go to Gmail Postmaster Tools, click the plus sign, enter your domain name, and then verify domain ownership using DNS TXT record.
3 Apr 2025 - Google Support
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