Postfix smtpd

220-nexus1.mainstreamdata.com ESMTP Postfix (Ubuntu)
250-nexus1.mainstreamdata.com
250-SIZE 52428800
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 11265346919796126 (0x2805c5f96d0d9e)
        Signature Algorithm: sha1WithRSAEncryption
        Issuer: C=US, ST=Arizona, L=Scottsdale, O=GoDaddy.com, Inc., OU=http:\/\/certificates.godaddy.com\/repository, CN=Go Daddy Secure Certification Authority/serialNumber=07969287
        Validity
            Not Before: Mar  7 17:57:44 2012 GMT
            Not After : Mar 23 17:55:17 2014 GMT
        Subject: O=*.mainstreamdata.com, OU=Domain Control Validated, CN=*.mainstreamdata.com
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)
                Modulus:
                    00:df:c3:09:9a:09:1d:3a:02:1c:e5:7d:15:bd:50:
                    09:a4:07:90:3a:df:27:76:e6:53:24:6e:92:79:51:
                    eb:9c:fd:ad:5b:d7:ec:3b:3e:3a:9d:e3:ba:d2:53:
                    89:77:e3:10:90:d7:28:f6:f9:65:5d:68:76:d3:85:
                    1d:00:7d:41:74:17:13:21:ad:44:6c:64:6f:ee:fb:
                    60:c8:31:eb:5b:1c:05:70:e7:db:30:2f:0f:ba:44:
                    b0:59:6f:da:44:9c:1a:a1:3a:c1:03:29:29:dc:45:
                    4a:80:0a:05:bc:62:e1:d3:52:0b:fa:fb:06:29:2a:
                    e0:2c:cf:b4:cb:f9:bf:7b:b3:13:30:b9:f8:9b:6a:
                    e4:23:30:4e:db:d2:51:27:1c:43:9a:cd:b5:0f:cc:
                    4a:65:ea:0c:52:1d:3f:00:70:c2:dd:65:80:e4:cd:
                    e0:07:b5:3f:95:34:06:86:ac:60:be:a0:99:ff:dc:
                    9f:1b:0f:c1:9c:cc:d5:68:e6:0a:ec:f2:4c:87:fd:
                    61:9d:f3:62:03:12:d1:2b:78:f1:b7:09:f4:d9:47:
                    65:38:80:5c:c6:d2:bd:e2:73:92:78:9e:1a:c1:38:
                    0b:ef:41:be:ab:ed:a8:a2:e4:d6:fc:1a:c8:28:8f:
                    a6:62:f0:c8:5b:66:89:5f:64:22:09:3e:23:09:e8:
                    db:db
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Basic Constraints: critical
                CA:FALSE
            X509v3 Extended Key Usage: 
                TLS Web Server Authentication, TLS Web Client Authentication
            X509v3 Key Usage: critical
                Digital Signature, Key Encipherment
            X509v3 CRL Distribution Points: 
                Full Name:
                  URI:http://crl.godaddy.com/gds1-66.crl
            X509v3 Certificate Policies: 
                Policy: 2.16.840.1.114413.1.7.23.1
                  CPS: http://certificates.godaddy.com/repository/
            Authority Information Access: 
                OCSP - URI:http://ocsp.godaddy.com/
                CA Issuers - URI:http://certificates.godaddy.com/repository/gd_intermediate.crt
            X509v3 Authority Key Identifier: 
                FD:AC:61:32:93:6C:45:D6:E2:EE:85:5F:9A:BA:E7:76:99:68:CC:E7
            X509v3 Subject Alternative Name: 
                DNS:*.mainstreamdata.com, DNS:mainstreamdata.com
            X509v3 Subject Key Identifier: 
                CA:B1:9F:1F:9F:99:D0:39:C5:C1:43:80:AC:B4:D8:DE:31:AD:0E:0D
    Signature Algorithm: sha1WithRSAEncryption
    Signature Value:
        a1:4a:e2:ee:73:b4:32:ee:f3:7b:25:07:e0:e9:6e:86:8c:7d:
        d4:f5:a8:93:25:99:78:47:85:80:71:ad:8b:c6:8b:bf:91:17:
        8a:1f:7a:86:bd:bf:31:d9:8e:9d:b2:4a:51:ef:ca:38:61:01:
        2d:09:40:8e:43:f1:88:56:52:2d:ab:3a:da:14:46:ec:6e:c2:
        03:9f:49:b3:63:3b:5c:33:98:27:0c:ca:d2:d3:32:20:8f:42:
        bc:e5:54:dd:1c:e4:0d:67:7c:c8:12:f6:53:44:2e:c1:b5:39:
        50:1c:72:b2:fe:3e:21:ec:f8:5f:2b:59:14:24:0b:f9:70:18:
        63:b3:54:0a:80:1c:15:a3:21:69:8a:ee:84:41:0f:d3:16:8f:
        e9:2d:f0:24:d9:4d:30:ea:c9:33:ad:be:2c:98:33:3b:84:12:
        1f:d0:3e:6c:43:df:a5:78:24:85:a0:27:7d:bf:8a:26:54:c7:
        7f:35:6c:59:a6:c6:31:86:c1:76:3c:6b:2e:44:42:84:f2:e5:
        08:c2:0d:e8:4d:43:61:f3:b9:f5:75:41:a7:03:97:54:7c:88:
        ab:fb:70:6b:cc:94:f3:6f:b4:84:a9:25:fe:7d:6b:8d:af:3e:
        e8:11:a8:d1:d1:f7:11:45:01:c6:5f:15:f4:fb:99:59:80:f4:
        19:d7:6f:15

9.9.5-3ubuntu0.19-Ubuntu
Resolver name: nexus1