Question 1

What is a VMC certificate?

Accepted Answer

A VMC (Verified Mark Certificate) is a digital certificate that allows organizations to display their brand logo in email clients that support BIMI (Brand Indicators for Message Identification). It provides cryptographic proof that the logo is authorized by the brand owner.

Question 2

Which Certificate Authorities issue VMC certificates?

Accepted Answer

VMC certificates are issued by five authorized Certificate Authorities: DigiCert, Entrust, Sectigo, GlobalSign, and SwissSign. These CAs are approved by the AuthIndicators Working Group.

Question 3

How long does a VMC certificate last?

Accepted Answer

VMC certificates are typically valid for 1 year. Organizations must renew their certificates before expiration to maintain BIMI logo display in email clients.

Question 4

What is BIMI?

Accepted Answer

BIMI (Brand Indicators for Message Identification) is an email specification that allows organizations to display their brand logo next to authenticated emails in supported email clients. It requires DMARC enforcement and a VMC certificate.

Question 5

How do I get a VMC certificate?

Accepted Answer

To obtain a VMC certificate, you need to: 1) Have a registered trademark for your logo, 2) Implement DMARC with enforcement policy (quarantine or reject), 3) Apply for a VMC certificate from an authorized CA, 4) Publish your BIMI record in DNS.

よくあるご質問

BIMI とは何ですか、またなぜ導入すべきですか？

VMC 証明書はどのようにしてブランドをフィッシングから守りますか？

VMC と CMC の違いは何ですか？

VMC を用いた BIMI の導入にはどのくらい時間がかかりますか？

BIMI を導入する前に DMARC は必要ですか？

どのメールプロバイダーが BIMI ロゴの表示をサポートしていますか？

BIMI と VMC の導入にはどのくらい費用がかかりますか？

BIMI は配信性や開封率を改善しますか？

VMC 証明書が失効したらどうなりますか？

BIMI は SPF や DKIM など他のメール認証規格とどのように関連しますか？

VMC Certificate Monitor はどのように機能しますか？

どの認証局を監視していますか？

自社の証明書を監視できますか？

自社ドメインに BIMI が設定されているかどうかはどう確認できますか？

BIMI 実装の要件は何ですか？