From 59f771e4e4f23529c9986e6679c7746804f6139c Mon Sep 17 00:00:00 2001
From: Jordan Holt <jordan@vimium.com>
Date: Mon, 26 May 2025 21:43:55 +0100
Subject: [PATCH] hosts/mail: add SMTP relay configuration

---
 hosts/mail/mail.nix | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/hosts/mail/mail.nix b/hosts/mail/mail.nix
index c897ae4..b608ada 100644
--- a/hosts/mail/mail.nix
+++ b/hosts/mail/mail.nix
@@ -23,7 +23,11 @@ in
     inputs.nixos-mailserver.nixosModule
   ];
 
-  age.secrets."passwords/users/jordan".file = "${inputs.secrets}/passwords/users/jordan.age";
+  age.secrets = {
+    "files/services/postfix/sasl_passwd".file =
+      "${inputs.secrets}/files/services/postfix/sasl_passwd.age";
+    "passwords/users/jordan".file = "${inputs.secrets}/passwords/users/jordan.age";
+  };
 
   services.roundcube = {
     enable = true;
@@ -71,4 +75,17 @@ in
       "abuse@vimium.com" = "jordan@vimium.com";
     };
   };
+
+  services.postfix.config = {
+    relayhost = "[mail.smtp2go.com]:2525";
+
+    smtp_sasl_auth_enable = "yes";
+    smtp_sasl_password_maps = "texthash:${
+      config.age.secrets."files/services/postfix/sasl_passwd".path
+    }";
+    smtp_sasl_security_options = "noanonymous";
+
+    smtp_destination_concurrency_limit = "20";
+    header_size_limit = "4096000";
+  };
 }