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[Blog] How to Solve the "Maximum Character Limit for SPF"?

By optimizing DNS records, it becomes possible to enjoy an error-free implementation.

There is a limit of 255 characters for SPF records, and exceeding this limit can corrupt the SPF, potentially leading to authentication failures. If you see the message "SPF exceeds maximum characters limit," it simply means that your DNS's SPF record is longer than the character limit specified in RFC7208. This can be problematic, especially when email delivery heavily relies on SPF compliance. [Contents] ■ Optimize to stay within the length limit of SPF ■ What happens if the SPF character limit is exceeded? ■ Strictly adhere to SPF record limits with PowerSPF *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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[Blog] How to Handle When SPF is Broken

Let's identify the cause of the SPF failure. There are several underlying reasons for the damage.

When an SPF record is broken, the DNS record will stop functioning. This can lead to the possibility of emails being lost during transmission or not being delivered as intended. When an SPF record is broken, the first step is to identify the cause of the breakage and proceed with troubleshooting. If you already feel overwhelmed by fixing a broken SPF, it is recommended to outsource the task. [Contents] ■ What is a broken SPF record? ■ Why does SPF data get corrupted? ■ What to do when SPF is broken? ■ How to automate this process? *For more details, you can view the related links. Please feel free to contact us for more information.

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[Blog] What is a DNS SOA Record?

Load balancing through zone transfer! Introduction to its importance, structure, procedures, and more in the blog.

The exact number of active websites continues to change, but on average, 175 new websites are created every minute. This means that 252,000 new websites are born each day. Needless to say, users cannot reach their desired page without entering the URL of the website. This is where the role of the DNS SOA record begins. What DNS records are and their types have already been explained previously. In this article, you will learn what a DNS SOA record is. Please read on to understand its importance, structure, procedures, and more. [Contents (excerpt)] ■ What is a DNS SOA record? ■ Why is an SOA record necessary? ■ What is zone transfer in DNS? ■ How does an SOA record function? *For more details about the blog, you can view it through the related links. Please feel free to contact us for more information.

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[Blog] Explanation of Overriding DMARC Policy

A very important factor in preventing email spoofing and impersonation! Introduction to a blog article.

This article will provide a detailed explanation of what DMARC policy overriding is, how it works, the difference between DMARC policy overriding and DMARC policy failure, and whether DMARC record overriding is legitimate. Please take a moment to read it. 【Contents (Excerpt)】 ■ Explanation of DMARC policy overriding ■ Understanding the DMARC policy overriding mechanism ■ The five values of DMARC policy overriding ■ Is DMARC policy overriding allowed? ■ Should DMARC policy overriding reports be sent? *For more details, you can view the related links. Please feel free to contact us for further information.

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How to fix the 550 SPF Check Failed?

Solve it with a few simple steps! Introduction to troubleshooting and more on the blog.

The message "550 SPF Check Failed" is a common error prompt that may occur when the sender's DNS lacks an SPF record, has an invalid record, or is triggered by third-party spam filters. An important point regarding this type of error is that it is usually the sender's responsibility, not the recipient's, and it can be resolved with a few simple steps. 【Contents】 ■ About SPF ■ What is the "550 SPF Check Failed" error? ■ Possible causes of the "550 SPF Check Failed" error ■ Troubleshooting the 550 SPF Check Failed Error *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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Relevant laws and regulations <Impersonation emails>

Starting with invoices and compliance with PCI DSS 4.0. It is related to phishing emails.

We will introduce the laws and systems related to phishing emails. Under the "Invoice System," it is stated that "when digitizing qualified invoices, it is necessary to implement phishing email countermeasures, similar to the Electronic Bookkeeping Act." The "Revised Electronic Bookkeeping Preservation Act" requires that "when sending invoices or receipts via email, they must be stored as electronic data." For more details, please be sure to read the published catalog. 【Related Laws and Systems】 ■ Invoice System (starting October 1, 2023) ■ Revised Electronic Bookkeeping Preservation Act (mandatory from January 1, 2024) ■ PCI DSS 4.0 compliance (by March 31, 2024) *For more information, please refer to the PDF materials or feel free to contact us.

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Web Performance Measurement and Monitoring: Catchpoint

A monitoring and measurement tool for websites, web apps, and mobile apps that obtains experimental data to clarify causal relationships based on experimental design methods!

We are the Japanese agency for Catchpoint, which is used by many renowned companies around the world, including Google and Microsoft. We can measure and monitor in over 1,000 locations across 80 countries and 161 cities worldwide. The measurement nodes in Japan are operated by Spelldata. 【Features】 ■ Measurement based on experimental design methods ■ Ability to obtain experimental data = clear causal relationships 【Domestic】 ■ Measurement centers are deployed in five cities in Japan: Sapporo, Niigata, Tokyo, Osaka, and Fukuoka ■ Measurement possible with NTT and KDDI optical lines ■ Measurement possible with mobile lines from Docomo, au, SoftBank, and Rakuten Mobile 【Overseas】 ■ Measurement centers deployed in over 1,000 locations worldwide ■ Covers major ISPs locally 【Measurement possible for all layers】 ■ BGP monitoring ■ Route, latency, hop count, and packet loss via Traceroute ■ DNS measurement and monitoring ■ API measurement and monitoring ■ Measurement and monitoring of single pages of websites ■ Measurement and monitoring of multiple pages involving page transitions on websites

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[Information] Cloudflare Company and Service Overview

Providing performance, security, reliability, and insights for anything connected to the internet!

Spelldata is the first agency in Asia and Japan to be certified as a managed service provider by Cloudflare in April 2020. This document includes an overview of Cloudflare, its features, and a summary of performance services. With high technical skills and implementation achievements, we support the introduction of Cloudflare on your site and maximize its performance. [Contents (partial)] ■ About Cloudflare ■ Overview of Cloudflare ■ Global Cloud Network ■ Integrated management of all origin infrastructure at the edge ■ Features of Cloudflare *For more details, please refer to the PDF document or feel free to contact us.

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Cloudflare's features

Performance, security, reliability, analysis! Covering the necessary features according to the scale of the site!

Cloudflare has four main features. In "Performance," it supports everything from simple cache rule settings using CDN to complex cache rules. Web optimization and mobile optimization are also possible. Additionally, it covers necessary features such as "Security," "Reliability," and "Analytics," depending on the scale of the site. You can view detailed features from the related links. 【Feature Composition (Partial)】 <Performance> ■CDN ■Web Optimization ■Mobile Optimization <Security> ■DDoS Protection ■IoT Security ■WAF ■Border Protection *For more details, please refer to the related links page or feel free to contact us.

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Cloudflare's TTL

Determining the priority of Cloudflare's TTL with a chart! Explained in an easy-to-understand way!

The determination of TTL in Cloudflare is complexly influenced by Cloudflare's Workers, Page Rules, and default caching. The related links explain this determination in a chart. It also provides explanations about "Expires and Cache-Control" and "Public and Private," so please take a look. 【Overview】 ■ For cache expiration, there are the absolute time-specified Expires header and the relative time-specified Cache-Control header. ■ The Cache-Control header can specify either the Public or Private directive to allow or disallow caching by intermediate proxies. *For more details, please refer to the related links page or feel free to contact us.

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Cloudflare's SLA

Guaranteed 100% operation! Introducing the differences in SLA between the Business plan and the Enterprise plan!

In accordance with the "Quality Assurance of Sales" stipulated in the revised Civil Code on Obligations scheduled to take effect on April 1, 2020, we clarify the SLA of Cloudflare's services. The Free and Pro plans do not have an SLA, while the Business and Enterprise plans do have an SLA. The Business plan is a self-service plan, so support is available via email, chat, or the Cloudflare community forum. Additionally, the Business plan includes a guarantee regarding availability, but there is no guarantee regarding performance. The Enterprise plan assigns a dedicated customer support manager and SE from Cloudflare. The significant difference is that it includes a performance guarantee, ensuring that delivery will always be faster than from the origin. Furthermore, during high load times, the Business plan may deliver from overseas data centers, whereas the Enterprise plan will scale out using domestic servers. *For more details, please refer to the related link page or feel free to contact us.

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What is information theory?

The quantitative value of information! The more surprising the information is to the reader, the higher its value!

The father of information technology stated, "The value of information is the magnitude of surprise." The more familiar the recipient is with the content of the information, the less valuable that information becomes. Conversely, the less the recipient knows about the content, the more valuable the information is. In other words, the value of information changes relatively based on how well the recipient understands the subject matter. This is defined as the amount of information. Based on probability theory, the way to quantify the value of information has been established. The greater the surprise from information that the reader does not know, the higher the value of that information. 【Levels of Communication Problems】 ■Level A: Technical Issues How accurately can symbols be transmitted in communication? ■Level B: Semantic Issues How accurately can the transmitted symbols convey the intended meaning? ■Level C: Effectiveness Issues How effectively does the received intention influence the desired action? *For more details, please refer to the PDF document or feel free to contact us.

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What is information quality?

Quality assessment of qualitative information! Introducing differences in quality based on expression, causality, and scope!

Information quality is a qualitative evaluation indicator of information. The value of information is considered to be the magnitude of surprise, according to information theory. So, if the content is surprising, is it acceptable to write dubious or false information? No, that is not correct. By checking the content against the indicators of information quality, it becomes possible to enhance the value of the content. The related links explain the differences between data quality and information quality. 【10 Indicators of Information Quality (Partial)】 ■ Authority/Reliability/Verifiability ■ Scope of Coverage ■ Composition and Organization ■ Objectivity ■ Integrity *For more details, please refer to the related links page or feel free to contact us.

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Content Quality Improvement Service Procedure

Valuable information varies from person to person! It starts with 'knowing yourself and knowing your opponent'!

The value of information is influenced by the difference between what the other party knows and what we possess, and this difference is calculated based on probability distributions. This consulting begins by clarifying what we know and what the other party does not know, starting from "knowing oneself and knowing the other." Consulting mainly consists of discussions and hearings. If objective data is needed, market research will also be conducted. 【Service Procedure】 ■1. Hearing ■2. Site Analysis ■3. Determination of Pages for Information Quality Improvement ■4. Page Analysis ■5. Application of Improvement Proposals ■6. Confirmation of Improvement Effects ■7. Formulation of Next Improvement Measures *For more details, please refer to the PDF document or feel free to contact us.

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Measures against email impersonation and email encryption specifications: What is MTA-STS?

Complete the encryption of the email delivery route along with SMTPS, POPS, and IMAPS!

On our company website, we introduce measures against spoofing emails and the specifications for email encryption. "MTA-STS" (Mail Transfer Agent Strict Transport Security) is a mechanism that allows email service providers to declare their ability to receive secure SMTP connections via TLS and specify whether to reject delivery to MX hosts that do not provide TLS with a trusted server certificate from the sending SMTP server. In the related links, we provide a detailed introduction to the issues with STARTTLS and the features of MTA-STS. Please take a look. [Contents] ■ Issues with STARTTLS ■ Mechanism of MTA-STS *Detailed information can be viewed from the related links. For more information, please feel free to contact us.

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Measurement Services×Spelldata - List of Manufacturers, Suppliers, Companies and Products

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