Implement mta-sts and move mail services to specific domain

1 files changed, 12 insertions, 4 deletions

diff --git a/modules/private/dns.nix b/modules/private/dns.nix
index 6647c14..01a3cbb 100644
--- a/modules/private/dns.nix
+++ b/modules/private/dns.nix
@@ -94,10 +94,10 @@
               ${conf.entries}
 
               ${if lib.attrsets.hasAttr "withEmail" conf && lib.lists.length conf.withEmail > 0 then ''
-              mail IN A     ${myconfig.env.servers.immaeEu.ips.main.ip4}
               mx-1 IN A     ${myconfig.env.servers.eldiron.ips.main.ip4}
-              ${builtins.concatStringsSep "\n" (map (i: "mail IN AAAA  ${i}") myconfig.env.servers.immaeEu.ips.main.ip6)}
+              mx-2 IN A     ${myconfig.env.servers.immaeEu.ips.main.ip4}
               ${builtins.concatStringsSep "\n" (map (i: "mx-1 IN AAAA  ${i}") myconfig.env.servers.eldiron.ips.main.ip6)}
+              ${builtins.concatStringsSep "\n" (map (i: "mx-2 IN AAAA  ${i}") myconfig.env.servers.immaeEu.ips.main.ip6)}
               ${lib.concatStringsSep "\n\n" (map (e:
               let
                 n = if e.domain == "" then "@" else "${e.domain}  ";
@@ -105,8 +105,8 @@
               in
               ''
               ; ------------------ mail: ${n} ---------------------------
-              ${n} IN MX 10 mail.${conf.name}.
-              ${n} IN MX 50 mx-1.${conf.name}.
+              ${n} IN MX 10 mx-1.${conf.name}.
+              ${n} IN MX 20 mx-2.${conf.name}.
 
               ; https://tools.ietf.org/html/rfc6186
               _submission._tcp${suffix} SRV  0 1  587 smtp.immae.eu.
@@ -116,6 +116,14 @@
               _pop3s._tcp${suffix}      SRV 10 1  995 pop3.immae.eu.
               _sieve._tcp${suffix}      SRV  0 1 4190 imap.immae.eu.
 
+              ; MTA-STS
+              ; https://blog.delouw.ch/2018/12/16/using-mta-sts-to-enhance-email-transport-security-and-privacy/
+              ; https://support.google.com/a/answer/9261504
+              _mta-sts${suffix}   IN TXT  "v=STSv1;id=20190630054629Z"
+              _smtp._tls${suffix} IN TXT  "v=TLSRPTv1;rua=mailto:postmaster+mta-sts@immae.eu"
+              mta-sts${suffix}    IN A    ${myconfig.env.servers.eldiron.ips.main.ip4}
+              ${builtins.concatStringsSep "\n" (map (i: "mta-sts${suffix}    IN AAAA ${i}") myconfig.env.servers.eldiron.ips.main.ip6)}
+
               ; Mail sender authentications
               ${n}                   IN TXT  "v=spf1 mx ~all"
               _dmarc${suffix}              IN TXT  "v=DMARC1; p=none; adkim=r; aspf=r; fo=1; rua=mailto:postmaster+rua@immae.eu; ruf=mailto:postmaster+ruf@immae.eu;"