I’d like to recommend that if you’re using an email delivery system, you should definitely set up SPF and DKIM configurations.
Background: Emails Not Delivered Without SPF and DKIM?
An acquaintance consulted me saying, “I’m having trouble with my mailing list system where emails aren’t reaching some recipients.”
When I investigated, I found that “SPF was configured but DKIM was not set up,” so I concluded that was likely the cause and recommended setting up DKIM.
What are SPF and DKIM
Regarding SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail), the following articles were easy to understand, so please refer to them:
- SPF, DKIMの特徴と違い | SendGridブログ
- SPFとは？ | SendGridブログ
- DKIMとは？ | SendGridブログ
- SendGridからメール送信する場合のSPFとDKIMの認証の仕組み – 前編 | SendGridブログ
- SendGridからメール送信する場合のSPFとDKIMの認証の仕組み – 後編 | SendGridブログ
In general, to understand email spoofing countermeasures, I recommend reading through “Anti-spoofing Portal Naritai” as it provides comprehensive understanding.
Choose Pricing Plans with SPF and DKIM Setup in Mind
Amazon SES and SendGrid allow you to set up SPF and DKIM without additional charges, but there seem to be services that don’t.
For example, “CombzMail,” an email delivery system, appears to offer DKIM configuration only in higher-tier pricing plans.
This means that even if a pricing plan looks cheap, you might end up with an expensive plan once you “set up SPF and DKIM.” Therefore, I recommend comparing pricing plans across email delivery services with the assumption that you’ll set up SPF and DKIM from the start.
SPF and DKIM Setup for Each Service
Amazon SES
AWS Official Documentation:
- Amazon SES における SPF を使った E メールの認証 - Amazon Simple Email Service
- Amazon SES における DKIM を使った E メールの認証 - Amazon Simple Email Service
Other helpful articles:
G Suite
SendGrid
Zendesk
I want to set up SPF and DKIM before the initial email transmission to improve email delivery rates. That’s all from the Gemba.