220 cstnet.cn Anti-spam GT for Coremail System (cnic.cn[20241204])
250-mail
250-PIPELINING
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN PLAIN
250-coremail 1Uxr2xKj7kG0xkI17xGrUDI0s8FY2U3Uj8Cz28x1UUUUU7Ic2I0Y2UrSAWMKUCa0xDrUUUUj
250-STARTTLS
250-SMTPUTF8
250 8BITMIME

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            0d:7f:94:43:1a:af:91:89:a8:dc:19:10:e6:fa:88:cc
        Signature Algorithm: sha256WithRSAEncryption
        Issuer: C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Secure Site CA G2
        Validity
            Not Before: Mar  5 00:00:00 2021 GMT
            Not After : Mar  9 23:59:59 2022 GMT
        Subject: C=CN, ST=beijing, O=Chinese Academy of Sciences Computer Network Information Center, CN=*.cstnet.cn
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)
                Modulus:
                    00:b1:4f:dd:0b:fd:92:96:69:cb:45:6b:65:22:34:
                    f4:d3:d0:11:16:de:10:88:ee:0f:a3:05:36:6a:19:
                    f1:0d:c3:81:3f:54:ae:a4:6b:82:c2:a2:cb:7b:f3:
                    c4:3d:48:40:f2:50:b3:39:5e:1f:05:d5:84:17:47:
                    6c:cc:ff:25:5c:e9:89:11:4b:70:e1:1b:5b:5c:64:
                    4f:4d:c3:16:cb:50:99:4a:b1:c6:d3:f8:3e:59:af:
                    91:b3:b4:8c:41:03:bd:bf:f1:ca:5d:bc:e8:03:11:
                    3d:70:0b:8f:18:15:b1:ee:b6:79:1a:2a:c6:08:9a:
                    79:c5:91:a4:9a:a8:c9:5c:ca:01:d5:53:70:18:41:
                    66:3a:90:14:01:d4:15:d6:b5:4a:d8:88:dc:0c:7b:
                    b5:8b:89:3a:e4:5f:1f:dc:9b:79:78:39:6f:25:75:
                    f3:3d:f1:f7:a2:14:f8:4a:05:36:a2:2a:8b:ff:a0:
                    e0:f8:18:f2:c5:d4:da:8c:6f:a2:f9:c9:da:a9:d6:
                    42:1f:59:cc:ca:cd:52:7e:cb:5a:61:01:cf:03:ee:
                    63:28:b3:f4:ac:04:64:0e:56:ea:20:1e:36:ab:fa:
                    54:55:0d:23:11:82:3f:46:eb:05:97:ac:f5:b9:4a:
                    5f:3d:28:23:85:33:c1:77:ba:c1:70:94:06:e2:eb:
                    6f:bb
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Authority Key Identifier: 
                C4:11:7E:88:40:86:C2:41:BF:65:F3:1A:E1:B4:53:40:A3:AB:EC:7D
            X509v3 Subject Key Identifier: 
                6F:6C:C3:D0:3E:02:C9:DD:8F:20:7D:EB:12:5B:06:C2:31:A2:C1:2D
            X509v3 Subject Alternative Name: 
                DNS:*.cstnet.cn, DNS:cstnet.cn
            X509v3 Key Usage: critical
                Digital Signature, Key Encipherment
            X509v3 Extended Key Usage: 
                TLS Web Server Authentication, TLS Web Client Authentication
            X509v3 CRL Distribution Points: 
                Full Name:
                  URI:http://crl3.digicert.com/SecureSiteCAG2.crl
                Full Name:
                  URI:http://crl4.digicert.com/SecureSiteCAG2.crl
            X509v3 Certificate Policies: 
                Policy: 2.23.140.1.2.2
                  CPS: http://www.digicert.com/CPS
            Authority Information Access: 
                OCSP - URI:http://ocsp.dcocsp.cn
                CA Issuers - URI:http://crl.digicert-cn.com/SecureSiteCAG2.crt
            X509v3 Basic Constraints: critical
                CA:FALSE
            CT Precertificate SCTs: 
                Signed Certificate Timestamp:
                    Version   : v1 (0x0)
                    Log ID    : 29:79:BE:F0:9E:39:39:21:F0:56:73:9F:63:A5:77:E5:
                                BE:57:7D:9C:60:0A:F8:F9:4D:5D:26:5C:25:5D:C7:84
                    Timestamp : Mar  5 06:50:19.672 2021 GMT
                    Extensions: none
                    Signature : ecdsa-with-SHA256
                                30:46:02:21:00:85:4A:3E:34:B2:9B:DC:F9:47:25:42:
                                F3:33:F3:FD:B2:45:76:16:15:CA:00:3A:CB:E4:87:F9:
                                8B:F4:03:DA:90:02:21:00:CC:8F:B0:E6:3D:E5:91:4A:
                                B8:D2:C4:0D:05:E0:D8:44:8D:1A:C1:BD:BB:8E:29:F0:
                                24:56:B7:D4:1A:2C:86:56
                Signed Certificate Timestamp:
                    Version   : v1 (0x0)
                    Log ID    : 22:45:45:07:59:55:24:56:96:3F:A1:2F:F1:F7:6D:86:
                                E0:23:26:63:AD:C0:4B:7F:5D:C6:83:5C:6E:E2:0F:02
                    Timestamp : Mar  5 06:50:19.631 2021 GMT
                    Extensions: none
                    Signature : ecdsa-with-SHA256
                                30:45:02:20:2E:2A:DA:D3:8C:F4:46:54:87:0C:83:C5:
                                A7:9F:58:DD:32:A6:F8:AC:BE:85:CE:49:CE:6B:B2:26:
                                58:27:BF:C6:02:21:00:AB:AC:7F:E1:65:92:F7:3C:23:
                                75:8B:42:02:4A:CE:56:3F:81:C7:EF:7D:39:BC:6E:84:
                                E8:09:D0:D4:AB:C0:91
    Signature Algorithm: sha256WithRSAEncryption
    Signature Value:
        bf:f1:07:69:92:10:3f:fe:15:78:d5:7b:02:52:4e:97:74:13:
        f2:24:a9:7f:8c:6e:f7:41:ba:4c:2d:16:18:b5:5c:7d:40:46:
        fc:91:1a:cb:7c:ea:55:ff:f9:bb:f4:cb:e7:d4:a5:ec:9c:6c:
        59:9c:f8:9a:6c:f5:ad:34:9c:00:d7:3b:8f:50:2d:51:59:a8:
        a3:b0:b3:89:01:68:46:2b:87:f5:ec:39:8a:47:b6:1a:4b:01:
        ab:73:21:01:b6:04:49:eb:1e:73:cf:2c:5b:ba:96:ba:42:90:
        0d:22:33:6c:c8:9c:22:9f:8f:f9:57:35:6e:f8:e9:67:31:3d:
        36:ca:a9:6d:c0:d6:6b:8f:f2:27:9e:29:e2:95:67:90:21:6f:
        92:90:81:8e:d7:56:ba:0e:5f:d6:36:8a:ee:d4:fc:79:89:f4:
        8e:71:c6:f9:c6:c2:f8:8a:01:40:57:ad:be:d7:97:b4:15:52:
        15:dd:9d:22:19:4f:8d:f4:c0:31:4c:67:b4:e0:87:fa:40:a3:
        49:3e:7e:03:b8:1c:60:fa:1b:78:e6:3c:b5:a7:2b:33:e6:02:
        a6:34:95:cf:81:69:2f:f0:1f:37:77:36:7b:23:90:ac:55:85:
        39:9f:59:40:36:6f:8b:c8:3c:55:fb:85:35:0e:35:a3:c3:66:
        4e:9a:fb:ad