SPF for each subdomain! We will introduce how to manage SPF for subdomains on the blog.
Unlike DMARC, SPF behaves differently for each subdomain. If you are unsure whether to set up SPF for your subdomains or whether to implement a separate (DMARC) policy for them, this article may be helpful. To summarize briefly, the DMARC policy of a domain is automatically applied to its subdomains. This means that if there is a DMARC record with p=reject published for company.com, emails sent from subdomains like support.company.com or marketing.company.com will inherit the same DMARC policy as the zone apex domain, so there is no need to manually configure individual sp (subdomain policy) DMARC tags. [Overview] ■ How does SPF work with subdomains? ■ Creating SPF records for subdomains ■ Why do subdomains (and domains) need SPF? ■ What is an SPF record? *You can view the detailed content of the blog through the related links. For more information, please feel free to contact us.
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We have established and operate measurement and monitoring centers in five cities across the country (Sapporo, Niigata, Tokyo, Osaka, and Fukuoka). The measurement and monitoring systems in operation there are also used by major IT companies such as Google and Microsoft, as well as e-commerce sites and mobile companies like Verizon. We monitor the communication status of your web systems from various locations 24/7, analyze the data, optimize it, and support high-speed and stable web operations. We can detect communication failures and server issues, which have been occurring frequently lately, through measurements from across the country and immediately raise alerts. Additionally, we provide a web performance tuning service that ensures the display speed of websites, web applications, and mobile applications is completed within one second nationwide, achieving a 98% yield. Based on statistical quality control, we conduct data collection and analysis, and guarantee the achievement of displaying within one second through genuine performance tuning that addresses issues from the source code. Please feel free to contact us if you have any requests.