Postfix smtpd

220 linux21.puntonet.cl ESMTP Postfix (Ubuntu)
250-linux21.puntonet.cl
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            9f:06:30:a4:b9:a8:03:35
        Signature Algorithm: sha256WithRSAEncryption
        Issuer: CN=linux3.puntonet.cl
        Validity
            Not Before: Sep  3 04:59:06 2019 GMT
            Not After : Aug 31 04:59:06 2029 GMT
        Subject: CN=linux3.puntonet.cl
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)
                Modulus:
                    00:dd:18:26:9a:60:75:70:67:1e:cf:46:9b:bc:04:
                    20:ed:b6:05:22:13:f4:f2:de:56:1c:65:22:1e:e0:
                    91:70:7a:e2:41:ea:f2:36:84:87:e7:3b:a3:fe:7b:
                    37:37:5d:b9:04:40:68:92:2b:40:e5:8c:88:8f:9e:
                    7c:81:4a:9c:ce:9c:13:02:22:62:23:c7:31:eb:37:
                    68:b0:31:9e:fc:91:59:19:c0:9d:6e:29:06:b9:6d:
                    24:85:4c:4e:40:30:a7:27:f4:fe:5c:ba:06:51:12:
                    e0:ce:bb:56:1f:bc:10:2f:a8:38:b6:60:82:d3:fb:
                    a1:91:1d:3d:ba:19:a3:82:ca:43:32:db:4a:00:1b:
                    fc:a1:d3:cb:5e:62:a1:01:cd:89:e1:4b:f5:ad:ce:
                    92:e0:71:67:96:d3:a6:8f:d2:64:c5:11:67:89:7a:
                    bc:97:b8:c0:8d:1b:c0:1d:68:da:63:b0:f5:bb:3d:
                    a0:3a:70:12:c4:c3:8c:7c:3b:18:a0:af:d1:09:7e:
                    10:2d:40:6f:14:e9:c0:8b:d4:36:00:d8:bd:b0:58:
                    0c:09:bb:37:da:4e:72:fc:04:92:cb:4d:f0:66:22:
                    89:94:16:78:e3:9e:06:4c:c6:49:d7:f7:fb:f6:b0:
                    17:e5:06:26:53:2d:87:c7:dc:d6:ea:15:d0:d9:41:
                    ee:e1
                Exponent: 65537 (0x10001)
        X509v3 extensions:
            X509v3 Basic Constraints: 
                CA:FALSE
    Signature Algorithm: sha256WithRSAEncryption
    Signature Value:
        d1:86:dd:b1:47:b2:0e:1f:e2:4b:29:9f:35:a7:45:bd:92:f2:
        73:50:3a:2e:a0:79:d0:f9:5c:46:04:13:4b:25:61:e2:5b:6c:
        aa:7d:89:79:cd:9f:f8:61:cd:33:d7:9d:6c:79:a9:17:e7:78:
        b5:01:b0:e5:94:4a:74:3c:80:de:33:b8:68:9f:36:26:7e:8e:
        76:d9:3a:ed:04:a2:ad:d9:16:1b:c9:7d:71:fe:a8:a1:54:2a:
        2b:a2:6c:f0:4a:c6:62:e0:82:38:bb:f1:2a:2f:b2:b4:13:47:
        63:81:e9:2a:2f:d4:f7:6f:fb:98:0e:d1:a3:62:82:19:53:a8:
        f8:3f:98:9f:73:54:81:a4:b7:d0:55:38:b9:cd:08:4c:30:64:
        1d:0b:e5:04:0b:8b:99:92:a5:4d:64:83:28:57:36:32:20:27:
        4c:d9:58:a1:78:68:91:52:83:51:d3:18:b1:26:d7:8f:bd:bb:
        22:fe:50:69:79:47:21:95:09:56:7b:65:76:92:f8:de:41:73:
        bc:04:34:56:98:52:68:a5:d7:e7:b8:41:c7:cd:03:9e:ed:9c:
        98:dd:57:29:29:7a:77:35:ca:04:dc:0e:c2:b1:8b:89:f8:a4:
        a0:c2:5c:6d:7e:bc:ce:00:49:fd:90:07:2a:60:43:72:61:7d:
        9f:ff:ad:c6