PGP-sign the list of fingerprints we use.

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+The following is an up-to date list of SHA-1 and SHA-256 fingerprints of all
+X.509 certificates Fripost uses on its publicly available services.  Please
+consider any mismatch as a man-in-the-middle attack, and let us know
+immediately! -- admin@fripost.org
+
+
+ * IMAP server
+    imap.fripost.org:993
+    SHA1   BE:CA:4E:39:C6:11:6B:FC:70:38:6C:DB:A6:7E:1C:10:2A:E5:09:C4
+    SHA256 12:D5:03:C2:D5:1C:D6:55:A9:50:FB:A4:99:69:E8:DC:3A:DE:50:74:D7:2A:F9:70:F2:80:73:13:CA:4D:56:B1
+
+ * SMTP servers (STARTTLS)
+    smtp.fripost.org:587 (Mail Submission Agent)
+    SHA1   03:87:02:C9:6E:01:D3:AD:BC:EC:77:CC:A5:C5:37:C1:D8:C1:29:BC
+    SHA256 6C:89:92:3C:A2:53:E0:14:9E:14:11:17:FF:FA:EB:12:3E:BA:0A:B0:C2:BE:70:18:8C:3D:7A:69:EB:00:5E:BB
+
+    mx1.fripost.org:25 (1st Mail eXchange)
+    SHA1   E0:3C:E7:05:2D:2E:99:7B:EF:A1:D0:5A:A7:79:2C:6D:0B:66:FD:17
+    SHA256 1B:B2:4B:47:8F:8A:7A:28:F0:AC:0C:EE:A5:29:7A:F2:6A:D2:11:81:AA:DD:F7:77:A0:EA:89:A6:DD:2A:59:56
+
+ * Web servers
+    fripost.org:443 (website), mail.fripost.org:443 (webmail), lists.fripost.org:443 (list manager)
+    SHA1   E1:82:59:FD:7F:9A:11:EF:DC:1B:46:3B:AB:9F:F6:BB:A0:E4:D4:59
+    SHA256 7D:F2:7C:67:90:91:EB:5E:1E:25:D0:7B:A4:A5:72:9F:EA:20:EC:F0:74:1C:25:66:1D:72:56:A3:3B:53:D9:9A
+
+    wiki.fripost.org:443 (wiki)
+    SHA1   96:4E:77:71:F3:2B:C7:60:50:58:37:53:C4:B1:F1:50:95:69:FD:C0
+    SHA256 D0:02:01:81:03:86:F3:53:8A:BA:DE:7D:07:D5:E0:31:D8:5B:5D:35:72:BC:68:8B:E4:BF:86:33:42:43:21:90
+
+    git.fripost.org:443 (git server and its web interface)
+    SHA1   EA:50:38:19:38:6A:49:BF:5D:3C:4D:04:64:6F:0D:D3:AC:20:76:C2
+    SHA256 08:D9:18:05:A3:F5:B6:8E:20:81:E1:8A:36:1B:44:AD:4E:36:6D:D1:BA:FC:3D:26:F9:F5:4B:68:A9:0F:F3:21
+
+    antilop.fripost.org:443 (list manager)
+    SHA1   6F:1A:3B:0F:2C:5A:BC:33:09:C6:D4:F8:43:2C:07:6E:B0:FD:DB:7B
+    SHA256 FA:AC:E2:4C:C7:DD:D8:A6:24:20:0E:48:FC:91:D2:F0:CC:BD:BD:57:B1:F9:67:84:73:96:F1:90:4C:50:C1:F1
+
+
+To get the whole certificate for imap.fripost.org:993, type the following
+command in a shell:
+
+    openssl s_client -connect imap.fripost.org:993 </dev/null
+
+(For protocols using the STARTTLS directive such as SMTP, you'll have to call
+s_client with '-starttls smtp'.  Another useful option is '-showcerts', which
+prints the whole server certificate chain.)
+
+You'll find the X.509 certificate wrapped between
+
+    -----BEGIN CERTIFICATE-----
+    [...]
+    -----END CERTIFICATE-----
+
+If you store it (including the delimiters) into /path/to/certificate.pem,
+you can then ensure that its fingerprints match the ones above:
+
+    openssl x509 -in /path/to/certificate.pem -noout -fingerprint -sha1
+    openssl x509 -in /path/to/certificate.pem -noout -fingerprint -sha256
+
+Alternatively, using a pipe:
+
+    openssl s_client -connect imap.fripost.org:993 </dev/null \
+    | openssl x509 -noout -fingerprint -sha256
+