In July 2019 we are changing the SSL certificate we use on www.pobox.com to be the same wildcard certificate we use for our mail servers, *.pobox.com. Please see our page about the *.pobox.com certificate for its details.
The certificate used until that change is an Extended Validation certificate issued by DigiCert. The organisation displayed in your browser is FastMail Pty Ltd. Its details are below.
DigiCert certificate
Certificate: Data: Version: 3 (0x2) Serial Number: 04:d7:e4:4e:a5:60:58:f5:fc:87:81:b7:4f:75:a0:79 Signature Algorithm: sha256WithRSAEncryption Issuer: C=US, O=DigiCert Inc, OU=www.digicert.com, CN=DigiCert SHA2 Extended Validation Server CA Validity Not Before: Jul 23 00:00:00 2018 GMT Not After : Jul 31 12:00:00 2019 GMT Subject: businessCategory=Private Organization/jurisdictionCountryName=AU/serialNumber=142 646 580, C=AU, ST=Victoria, L=Melbourne, O=FastMail Pty Ltd, CN=www.pobox.com Subject Public Key Info: Public Key Algorithm: rsaEncryption Public-Key: (2048 bit) Modulus: 00:bf:4d:dc:ee:0f:dc:47:58:d6:cc:60:76:7c:14: c9:0b:ef:b9:5e:48:42:cf:05:62:f3:cd:51:94:b2: 9f:7b:66:0b:37:46:64:2f:fa:4c:4a:73:3a:bb:6c: 6c:b5:90:3b:63:2f:bf:fa:b1:ef:c7:c4:15:17:5f: 73:09:ba:2b:41:ae:9a:32:4a:18:49:d0:3e:95:12: 19:23:9d:d6:3b:f2:17:18:4e:3f:ea:c9:fd:b1:16: 7d:b2:b7:bb:09:be:c0:04:09:fb:7d:03:b4:ea:1c: 75:aa:53:41:0e:ac:39:47:dd:72:ee:68:b5:49:ba: 6f:fd:66:fb:60:e9:68:cc:5b:2a:60:a4:8a:0a:2d: 32:85:0c:5f:fa:0a:78:ba:52:f3:5b:44:cc:78:31: 0d:c9:9f:6d:55:1b:c6:04:4b:db:d9:96:7b:01:d0: eb:ef:64:74:08:34:25:87:3f:1a:d4:8f:4f:91:fb: 43:51:ab:7f:b9:7a:a7:02:7f:35:9e:3e:e5:b9:45: 7b:d4:6d:a2:2a:ec:54:dc:24:0e:f3:e8:80:d4:7b: 2d:c3:59:46:3c:4d:4c:ef:b0:39:14:00:dd:e7:1a: 8e:ed:c5:ab:b5:7a:49:6e:9b:b1:9d:2c:a4:31:21: fc:3c:4e:9e:ad:96:94:7d:c6:ab:23:f3:27:94:66: b9:03 Exponent: 65537 (0x10001) X509v3 extensions: X509v3 Authority Key Identifier: keyid:3D:D3:50:A5:D6:A0:AD:EE:F3:4A:60:0A:65:D3:21:D4:F8:F8:D6:0F X509v3 Subject Key Identifier: 06:66:C1:09:3B:2C:F6:0B:ED:A6:F8:F7:E4:19:99:0B:86:57:94:3D X509v3 Subject Alternative Name: DNS:www.pobox.com, DNS:pobox.com, DNS:listbox.com, DNS:www.listbox.com, DNS:webmail.pobox.com 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/sha2-ev-server-g2.crl Full Name: URI:http://crl4.digicert.com/sha2-ev-server-g2.crl X509v3 Certificate Policies: Policy: 2.16.840.1.114412.2.1 CPS: https://www.digicert.com/CPS Policy: 2.23.140.1.1 Authority Information Access: OCSP - URI:http://ocsp.digicert.com CA Issuers - URI:http://cacerts.digicert.com/DigiCertSHA2ExtendedValidationServerCA.crt X509v3 Basic Constraints: critical CA:FALSE 1.3.6.1.4.1.11129.2.4.2: ......u.......q...#...{G8W. .R....d6.......d.B.0.....F0D. r{K..Y.x...O...j.....d.<f,..d.... qQ'..!.Zt...!..1..SU..{X.p..8.\).v.V.../.......D.>.Fv....\....U.......d.B.......G0E.!..%.67.C.....8.f...#....= .;...N. E..4U.....^.4...3....F"XW.C.[M.~ Signature Algorithm: sha256WithRSAEncryption 36:b1:47:86:dc:d1:8c:54:c8:3b:59:93:22:39:ca:97:7c:3c: 35:a5:19:68:94:12:9c:bd:1d:8c:07:fc:94:e8:8f:73:dc:be: cd:f7:b7:2c:5e:40:9f:0f:ed:12:cb:35:a7:0c:25:da:8f:95: 71:7d:7f:32:59:ad:67:92:c9:ff:15:21:f6:c3:1f:9f:04:0c: fa:42:c6:ce:f4:77:28:67:b6:0d:70:97:d4:b4:cb:e3:fc:42: 4e:45:90:32:d2:19:23:df:b8:80:f1:cb:f8:30:80:51:b1:87: 9e:02:58:6a:60:52:b6:e9:6b:f1:68:60:09:fd:a5:c7:89:35: 81:bb:89:60:6b:27:6e:1f:9c:f7:65:fe:f7:d4:5d:2f:74:6f: 20:28:37:b7:cd:c9:43:e0:f6:d5:0c:87:ab:f3:cf:fa:bb:62: 99:e5:ad:29:4f:a1:83:a2:9b:3b:77:4f:61:0e:c5:cb:07:fa: f3:e3:56:56:ec:80:84:71:0c:3d:da:37:02:3b:f2:70:a8:00: d1:ad:b5:ce:f3:a2:be:b0:fa:43:3e:13:86:7e:6d:a3:2f:4c: 5f:49:ac:be:f8:47:e2:c1:b6:4a:c6:23:44:a4:c6:60:ee:b0: 87:24:4c:64:19:65:ac:e1:f7:2e:9e:c8:51:33:7b:bb:83:1f: 60:8a:25:81