RAKUS Light Cloud Co., Ltd.

blastmail.jp · JP · Issued by GlobalSign nv-sa

Cloud email and messaging services provider in Japan

★★★ 5/10TechnologyEstablished Japanese cloud company, recognized in regional market

PrecertExpires in about 1 yearVMCRegisteredView Final CertASN.1 crt.sh crt.sh Final

Certificate Summary

Fingerprint (SHA-256)9bb9af07c3a89584a299019e5218c1661e144914ad4c39ceaf56cf383a51fbd9

Serial Number2c:98:fb:b6:b8:c2:a9:1b:5e:07:35:89

Issued2026-02-13

Expires2027-03-17

Root CAGlobalSign

SubjectRAKUS Light Cloud Co., Ltd., JP

SANsblastmail.jp

CT LogGorgon (DigiCert) #31403 · 2026-02-13 03:41 UTC (about 1 month ago)

Certificate Lint

2 errors1 warning22 passed

MCR (Mark Certificate Requirements)2 fails

✓

EKU must contain BIMI OIDMCR §7.1.2.7 ↗

e_bimi_eku_present

✓

EKU must contain only BIMI OIDMCR §7.1.2.7 ↗

e_bimi_eku_single

✓

Name Constraints must not be presentMCR §7.1.2.7 ↗

e_bimi_no_name_constraints

✗

Key Usage must include digitalSignatureerrorMCR §7.1.2.7 ↗

Key Usage extension is missing

e_bimi_key_usage

✓

Validity period must not exceed 825 daysMCR §6.3.2 ↗

e_bimi_validity_period

✗

SCT List extension must be presenterrorMCR §7.1.2.7 ↗

SCT List extension is missing

e_bimi_sct_present

✓

Pilot ID extension must not be presentMCR §7.1.2.7 ↗

e_bimi_pilot_id_absent

✓

BIMI General Policy OID must be presentMCR §7.1.6.4 ↗

e_bimi_general_policy

✓

CPS URL must be present in certificate policiesMCR §7.1.6.4 ↗

e_bimi_cps_url_present

✓

Mark type must be present and validMCR §7.1.4.2.2 ↗

e_bimi_mark_type_valid

✓

Trademark Office must be present for Registered MarkMCR §7.1.4.2 ↗

e_bimi_mark_type_dn_trademark_office

✓

Trademark Country must be present for Registered MarkMCR §7.1.4.2 ↗

e_bimi_mark_type_dn_trademark_country

✓

Trademark Registration ID must be present for Registered MarkMCR §7.1.4.2 ↗

e_bimi_mark_type_dn_trademark_registration_id

✓

Logotype extension must be presentMCR §7.1.2.7 ↗

e_bimi_logotype_present

✓

Logotype must contain data: URIMCR §7.1.2.7 ↗

e_bimi_logotype_data_uri

✓

SVG must be gzip-compressedMCR §7.1.2.7 ↗

e_bimi_svg_compressed

✓

SVG must conform to SVG Tiny PSMCR §7.1.2.7 ↗

e_bimi_svg_tiny_ps

✓

RSA key must be at least 2048 bitsMCR §6.1.5 ↗

w_bimi_rsa_key_size

—

ECDSA key must use P-256 or P-384MCR §6.1.5 ↗

w_bimi_ecdsa_curve

✓

Signature hash should be SHA-256 or strongerMCR §6.1.5 ↗

w_bimi_sig_hash

RFC 5280 (X.509)

✓

Certificate must not be a CARFC 5280 §4.2.1.9 ↗

BasicConstraints extension absent (correct for end-entity certificates)

e_bimi_basic_constraints

—

Key Usage extension must be criticalRFC 5280 §4.2.1.3 ↗

e_bimi_key_usage_critical

CA/Browser Forum1 fail

✓

Serial number should contain at least 64 bits of entropyCABF ↗

w_bimi_serial_entropy

✗

CA-specific policy OID should be presentwarningCABF ↗

No known CA-specific VMC policy OID found

w_bimi_ca_policy_oid

RFC 3709 (Logotype)

✓

Logotype extension must not be criticalRFC 3709 §2.1 ↗

e_bimi_logotype_not_critical

✓

Logotype must contain a hashRFC 3709 §2.1 ↗

e_bimi_logotype_hash_present

✓

Logotype hash should use SHA-256RFC 3709 §2.1 ↗

n_bimi_logotype_hash_sha256

Embedded Logo

SVG Hash5a44f4f0

Revocation Status

No OCSP or CRL endpoints found in this certificate's extensions.

Certificate Details

Serial Number: 2c:98:fb:b6:b8:c2:a9:1b:5e:07:35:89

Issuer:

commonName: GlobalSign GCC R42 Verified Mark CA 2023

organizationName: GlobalSign nv-sa

Validity:

Not Before: Fri, 13 Feb 2026 03:41:52 UTC

Not After: Wed, 17 Mar 2027 03:41:51 UTC

Subject:

organizationName: RAKUS Light Cloud Co., Ltd.

countryName: JP

stateOrProvinceName: Tokyo

localityName: Shibuya

BIMI Trademark Office: Japan Patent Office

BIMI Trademark Country: JP

BIMI Trademark ID: 6159895

BIMI Mark Type: Registered Mark

Jurisdiction Country: JP

Business Category: Private Organization

Serial Number: 011001043240

Street Address: 5-27-5 Sendagaya

Subject Alternative Names:

DNS:blastmail.jp

X509v3 Extensions:

Subject Key Identifier(2.5.29.14):C1:8F:3E:0B:B7:29:CE:8E:DF:6B:BB:0B:15:BC:66:49:9D:E8:2D:11

Subject Alternative Name(2.5.29.17):blastmail.jp

CRL Distribution Points(2.5.29.31):http://crl.globalsign.com/gsgccr42verifiedmarkca2023.crl

Certificate Policies(2.5.29.32):1.3.6.1.4.1.4146.10.6.1 https://www.globalsign.com/repository/ BIMI Mark Certificate General Policy

Authority Key Identifier(2.5.29.35):8C:D8:30:07:82:CE:11:51:FA:0B:B7:EF:B7:46:95:72:C1:76:B3:4E

Extended Key Usage(2.5.29.37):Brand Indicator for Message Identification (BIMI)

Authority Information Access(1.3.6.1.5.5.7.1.1):CA Issuers: http://secure.globalsign.com/cacert/gsgccr42verifiedmarkca2023.crt OCSP: http://ocsp.globalsign.com/gsgccr42verifiedmarkca2023

Logotype (BIMI)(1.3.6.1.5.5.7.1.12):Embedded SVG logotype (see Logo section)

CT Precert Poison(1.3.6.1.4.1.11129.2.4.3):Precertificate poison (critical)

ASN.1 Structure

Certificate Chain

Leaf CertificateRAKUS Light Cloud Co., Ltd.

Position 0

Subject: 2.5.4.15=Private Organization, 2.5.4.5=011001043240, 1.3.6.1.4.1.311.60.2.1.3=JP, C=JP, ST=Tokyo, L=Shibuya, 2.5.4.9=5-27-5 Sendagaya, O=RAKUS Light Cloud Co.\, Ltd., 1.3.6.1.4.1.53087.1.13=Registered Mark, 1.3.6.1.4.1.53087.1.2=Japan Patent Office, 1.3.6.1.4.1.53087.1.3=JP, 1.3.6.1.4.1.53087.1.4=6159895

Issuer: C=BE, O=GlobalSign nv-sa, CN=GlobalSign GCC R42 Verified Mark CA 2023

Serial: 2c:98:fb:b6:b8:c2:a9:1b:5e:07:35:89

SHA-256: 9bb9af07c3a89584...3a51fbd9

2026-02-13 – 2027-03-17

Intermediate CAGlobalSign nv-sa

Position 1

Subject: C=BE, O=GlobalSign nv-sa, CN=GlobalSign GCC R42 Verified Mark CA 2023

Issuer: C=BE, O=GlobalSign nv-sa, CN=GlobalSign Verified Mark Root R42

Serial: 7f:e5:30:93:0b:86:4a:36:ef:80:ba:86:86:c1:a9:ae

SHA-256: 0fa93b3456322b76...88cd4983

2023-11-15 – 2038-11-15

Root CAGlobalSign nv-sa

Position 2

Subject: C=BE, O=GlobalSign nv-sa, CN=GlobalSign Verified Mark Root R42

Issuer: C=BE, O=GlobalSign nv-sa, CN=GlobalSign Verified Mark Root R42

Serial: 7f:e5:30:03:81:98:a7:5f:7d:17:c0:0f:24:2c:ab:f3

SHA-256: cd122cb877c6928b...524e7e0b

2023-11-15 – 2042-11-15

Raw PEM