Postfix smtpd

220 caribbean.csxkd.com ESMTP Postfix
250-caribbean.csxkd.com
250-8BITMIME
250-STARTTLS
250 Ok

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            3b:01:50:6b:36:93:61:db:d0:27:56:d5:31:0b:92:35
        Signature Algorithm: ecdsa-with-SHA384
        Issuer: C=AT, O=ZeroSSL, CN=ZeroSSL ECC Domain Secure Site CA
        Validity
            Not Before: Jan 16 00:00:00 2025 GMT
            Not After : Apr 16 23:59:59 2025 GMT
        Subject: CN=caribbean.csxkd.com
        Subject Public Key Info:
            Public Key Algorithm: id-ecPublicKey
                Public-Key: (256 bit)
                pub:
                    04:77:29:5b:17:81:e1:73:a6:e1:33:0a:65:2a:e0:
                    f9:74:62:d9:a2:80:42:4f:d2:12:e0:33:69:20:71:
                    73:fe:ac:3d:fc:e2:a9:1f:08:cc:5a:f8:29:de:e9:
                    bf:fc:bf:6e:a5:4a:73:09:98:2d:78:b8:2c:c3:3f:
                    33:af:b1:73:02
                ASN1 OID: prime256v1
                NIST CURVE: P-256
        X509v3 extensions:
            X509v3 Authority Key Identifier: 
                0F:6B:E6:4B:CE:39:47:AE:F6:7E:90:1E:79:F0:30:91:92:C8:5F:A3
            X509v3 Subject Key Identifier: 
                D9:4C:B2:50:59:32:E3:49:D9:3A:24:8B:13:D2:B1:BA:DC:12:5C:51
            X509v3 Key Usage: critical
                Digital Signature
            X509v3 Basic Constraints: critical
                CA:FALSE
            X509v3 Extended Key Usage: 
                TLS Web Server Authentication, TLS Web Client Authentication
            X509v3 Certificate Policies: 
                Policy: 1.3.6.1.4.1.6449.1.2.2.78
                  CPS: https://sectigo.com/CPS
                Policy: 2.23.140.1.2.1
            Authority Information Access: 
                CA Issuers - URI:http://zerossl.crt.sectigo.com/ZeroSSLECCDomainSecureSiteCA.crt
                OCSP - URI:http://zerossl.ocsp.sectigo.com
            CT Precertificate SCTs: 
                Signed Certificate Timestamp:
                    Version   : v1 (0x0)
                    Log ID    : CF:11:56:EE:D5:2E:7C:AF:F3:87:5B:D9:69:2E:9B:E9:
                                1A:71:67:4A:B0:17:EC:AC:01:D2:5B:77:CE:CC:3B:08
                    Timestamp : Jan 16 00:11:56.246 2025 GMT
                    Extensions: none
                    Signature : ecdsa-with-SHA256
                                30:45:02:20:43:F7:B1:55:33:9D:F9:13:BD:B2:01:0E:
                                E9:FD:CB:E8:A3:15:1F:52:96:5F:B0:78:02:CC:3B:DB:
                                A5:47:4C:16:02:21:00:CA:00:F8:49:54:71:C5:9C:B1:
                                1A:97:1A:91:F6:ED:68:5F:24:8D:F5:DB:23:76:AC:5F:
                                AC:C3:C7:99:FB:1B:7C
                Signed Certificate Timestamp:
                    Version   : v1 (0x0)
                    Log ID    : CC:FB:0F:6A:85:71:09:65:FE:95:9B:53:CE:E9:B2:7C:
                                22:E9:85:5C:0D:97:8D:B6:A9:7E:54:C0:FE:4C:0D:B0
                    Timestamp : Jan 16 00:11:56.199 2025 GMT
                    Extensions: none
                    Signature : ecdsa-with-SHA256
                                30:46:02:21:00:F8:52:4E:BC:03:BC:08:38:1D:94:ED:
                                27:00:5A:71:5D:21:CF:87:61:F2:49:CA:F5:37:00:48:
                                60:D2:87:75:C1:02:21:00:DC:16:66:02:90:81:B2:9D:
                                11:A3:BC:A6:6A:30:FB:B9:1E:8D:02:A3:85:F9:FE:F0:
                                D5:84:0F:2C:EB:ED:8F:59
            X509v3 Subject Alternative Name: 
                DNS:caribbean.csxkd.com
    Signature Algorithm: ecdsa-with-SHA384
    Signature Value:
        30:64:02:30:6e:4e:1a:f3:57:67:f7:ef:bf:44:13:b5:13:bc:
        b8:85:9b:ed:99:90:d3:1a:b2:fc:16:9d:4b:b7:2b:62:4d:45:
        10:87:1e:86:51:fb:26:00:49:4c:58:c0:5b:70:24:37:02:30:
        62:c6:40:71:80:e3:cd:8d:88:36:cc:59:a0:e4:66:34:4a:7c:
        44:ff:cb:52:6b:05:fd:f0:31:82:61:43:ce:32:05:69:a1:0c:
        c9:03:d5:f2:bb:2e:0b:28:31:1d:80:23