1 { lib, pkgs, config, myconfig, ... }:
3 config.secrets.keys = [
5 dest = "postfix/mysql_alias_maps";
6 user = config.services.postfix.user;
7 group = config.services.postfix.group;
10 # We need to specify that option to trigger ssl connection
12 user = ${myconfig.env.mail.postfix.mysql.user}
13 password = ${myconfig.env.mail.postfix.mysql.password}
14 hosts = unix:${myconfig.env.mail.postfix.mysql.socket}
15 dbname = ${myconfig.env.mail.postfix.mysql.database}
16 query = SELECT DISTINCT destination
17 FROM forwardings_merge
19 ((regex = 1 AND '%s' REGEXP CONCAT('^',source,'$') ) OR (regex = 0 AND source = '%s'))
24 FROM forwardings_blacklisted
27 SELECT 'devnull@immae.eu'
28 FROM forwardings_blacklisted
33 dest = "postfix/mysql_mailbox_maps";
34 user = config.services.postfix.user;
35 group = config.services.postfix.group;
38 # We need to specify that option to trigger ssl connection
40 user = ${myconfig.env.mail.postfix.mysql.user}
41 password = ${myconfig.env.mail.postfix.mysql.password}
42 hosts = unix:${myconfig.env.mail.postfix.mysql.socket}
43 dbname = ${myconfig.env.mail.postfix.mysql.database}
44 result_format = /%d/%u
45 query = SELECT DISTINCT '%s'
49 (domain = '%d' AND user = '%u' AND regex = 0)
52 AND '%d' REGEXP CONCAT('^',domain,'$')
53 AND '%u' REGEXP CONCAT('^',user,'$')
60 dest = "postfix/mysql_sender_login_maps";
61 user = config.services.postfix.user;
62 group = config.services.postfix.group;
65 # We need to specify that option to trigger ssl connection
67 user = ${myconfig.env.mail.postfix.mysql.user}
68 password = ${myconfig.env.mail.postfix.mysql.password}
69 hosts = unix:${myconfig.env.mail.postfix.mysql.socket}
70 dbname = ${myconfig.env.mail.postfix.mysql.database}
71 query = SELECT DISTINCT destination
72 FROM forwardings_merge
74 ((regex = 1 AND '%s' REGEXP CONCAT('^',source,'$') ) OR (regex = 0 AND source = '%s'))
80 config.networking.firewall.allowedTCPPorts = [ 25 465 587 ];
82 config.nixpkgs.overlays = [ (self: super: {
83 postfix = super.postfix.override { withMySQL = true; };
85 config.users.users."${config.services.postfix.user}".extraGroups = [ "keys" ];
86 config.services.filesWatcher.postfix = {
89 config.secrets.fullPaths."postfix/mysql_alias_maps"
90 config.secrets.fullPaths."postfix/mysql_mailbox_maps"
91 config.secrets.fullPaths."postfix/mysql_sender_login_maps"
94 config.services.postfix = {
97 name = n: i: "relay_${n}_${toString i}";
98 pair = n: i: m: lib.attrsets.nameValuePair (name n i) (
100 then pkgs.writeText (name n i) m.content
103 pairs = n: v: lib.imap1 (i: m: pair n i m) v.recipient_maps;
104 in lib.attrsets.filterAttrs (k: v: v != null) (
105 lib.attrsets.listToAttrs (lib.flatten (
106 lib.attrsets.mapAttrsToList pairs myconfig.env.mail.postfix.backup_domains
109 relay_restrictions = lib.attrsets.filterAttrs (k: v: v != null) (
110 lib.attrsets.mapAttrs' (n: v:
111 lib.attrsets.nameValuePair "recipient_access_${n}" (
112 if lib.attrsets.hasAttr "relay_restrictions" v
113 then pkgs.writeText "recipient_access_${n}" v.relay_restrictions
116 ) myconfig.env.mail.postfix.backup_domains
119 recipient_maps // relay_restrictions;
121 ### postfix module overrides
122 readme_directory = "${pkgs.postfix}/share/postfix/doc";
123 smtp_tls_CAfile = lib.mkForce "";
124 smtp_tls_cert_file = lib.mkForce "";
125 smtp_tls_key_file = lib.mkForce "";
127 message_size_limit = "1073741824"; # Don't put 0 here, it's not equivalent to "unlimited"
128 alias_database = "\$alias_maps";
130 ### Virtual mailboxes config
131 virtual_alias_maps = "mysql:${config.secrets.fullPaths."postfix/mysql_alias_maps"}";
132 virtual_mailbox_domains = myconfig.env.mail.postfix.additional_mailbox_domains
133 ++ lib.remove "localhost.immae.eu" (lib.remove null (lib.flatten (map
136 then "${e.domain}${lib.optionalString (e.domain != "") "."}${zone.name}"
139 (zone.withEmail or [])
141 myconfig.env.dns.masterZones
143 virtual_mailbox_maps = "mysql:${config.secrets.fullPaths."postfix/mysql_mailbox_maps"}";
144 dovecot_destination_recipient_limit = "1";
145 virtual_transport = "dovecot";
148 relay_domains = lib.flatten (lib.attrsets.mapAttrsToList (n: v: v.domains or []) myconfig.env.mail.postfix.backup_domains);
149 relay_recipient_maps = lib.flatten (lib.attrsets.mapAttrsToList (n: v:
150 lib.imap1 (i: m: "${m.type}:/etc/postfix/relay_${n}_${toString i}") v.recipient_maps
151 ) myconfig.env.mail.postfix.backup_domains);
152 smtpd_relay_restrictions = [
154 "permit_sasl_authenticated"
155 "defer_unauth_destination"
156 ] ++ lib.flatten (lib.attrsets.mapAttrsToList (n: v:
157 if lib.attrsets.hasAttr "relay_restrictions" v
158 then [ "check_recipient_access hash:/etc/postfix/recipient_access_${n}" ]
160 ) myconfig.env.mail.postfix.backup_domains);
162 ### Additional smtpd configuration
163 smtpd_tls_received_header = "yes";
164 smtpd_tls_loglevel = "1";
166 ### Email sending configuration
167 smtp_tls_security_level = "may";
168 smtp_tls_loglevel = "1";
170 ### Force ip bind for smtp
171 smtp_bind_address = myconfig.env.servers.eldiron.ips.main.ip4;
172 smtp_bind_address6 = builtins.head myconfig.env.servers.eldiron.ips.main.ip6;
174 # #Unneeded if postfix can only send e-mail from "self" domains
175 # #smtp_sasl_auth_enable = "yes";
176 # #smtp_sasl_password_maps = "hash:/etc/postfix/relay_creds";
177 # #smtp_sasl_security_options = "noanonymous";
178 # #smtp_sender_dependent_authentication = "yes";
179 # #sender_dependent_relayhost_maps = "hash:/etc/postfix/sender_relay";
181 ### opendkim, opendmarc, openarc milters
182 non_smtpd_milters = [
183 "unix:${config.myServices.mail.milters.sockets.opendkim}"
184 "unix:${config.myServices.mail.milters.sockets.opendmarc}"
185 "unix:${config.myServices.mail.milters.sockets.openarc}"
188 "unix:${config.myServices.mail.milters.sockets.opendkim}"
189 "unix:${config.myServices.mail.milters.sockets.opendmarc}"
190 "unix:${config.myServices.mail.milters.sockets.openarc}"
195 enableSubmission = true;
196 submissionOptions = {
197 smtpd_tls_security_level = "encrypt";
198 smtpd_sasl_auth_enable = "yes";
199 smtpd_tls_auth_only = "yes";
200 smtpd_sasl_tls_security_options = "noanonymous";
201 smtpd_sasl_type = "dovecot";
202 smtpd_sasl_path = "private/auth";
203 smtpd_reject_unlisted_recipient = "no";
204 smtpd_client_restrictions = "permit_sasl_authenticated,reject";
205 # Refuse to send e-mails with a From that is not handled
206 smtpd_sender_restrictions =
207 "reject_sender_login_mismatch,reject_unlisted_sender,permit_sasl_authenticated,reject";
208 smtpd_sender_login_maps = "mysql:${config.secrets.fullPaths."postfix/mysql_sender_login_maps"}";
209 smtpd_recipient_restrictions = "permit_sasl_authenticated,reject";
210 milter_macro_daemon_name = "ORIGINATING";
211 smtpd_milters = "unix:${config.myServices.mail.milters.sockets.opendkim}";
213 # FIXME: Mail adressed to localhost.immae.eu will still have mx-1 as
214 # prioritized MX, which provokes "mail for localhost.immae.eu loops
215 # back to myself" errors. This transport entry forces to push
216 # e-mails to its right destination.
218 localhost.immae.eu smtp:[immae.eu]:25
220 destination = ["localhost"];
221 # This needs to reverse DNS
222 hostname = "eldiron.immae.eu";
224 sslCert = "/var/lib/acme/mail/fullchain.pem";
225 sslKey = "/var/lib/acme/mail/key.pem";
226 recipientDelimiter = "+";
232 args = ["-o" "smtpd_tls_wrappermode=yes" ] ++ (let
233 mkKeyVal = opt: val: [ "-o" (opt + "=" + val) ];
234 in lib.concatLists (lib.mapAttrsToList mkKeyVal config.services.postfix.submissionOptions)
243 # rspamd could be used as a milter, but then it cannot apply
244 # its checks "per user" (milter is not yet dispatched to
245 # users), so we wrap dovecot-lda inside rspamc per recipient
247 dovecot_exe = "${pkgs.dovecot}/libexec/dovecot/dovecot-lda -f \${sender} -a \${original_recipient} -d \${user}@\${nexthop}";
249 "flags=DRhu" "user=vhost:vhost"
250 "argv=${pkgs.rspamd}/bin/rspamc -h ${config.myServices.mail.rspamd.sockets.worker-controller} -c bayes -d \${user}@\${nexthop} --mime --exec {${dovecot_exe}}"
255 config.security.acme.certs."mail" = {
257 systemctl restart postfix.service
260 "smtp.immae.eu" = null;