From 608cb2ffdaff7db6b3af0630980d84af6e7099ce Mon Sep 17 00:00:00 2001
From: cking285 <chad@polarity.io>
Date: Wed, 20 Dec 2023 14:02:46 -0800
Subject: [PATCH] feat(hostname): hostname can now be configured for gen_smtp

---
 lib/mailman/external_smtp_adapter.ex | 37 +++++++++++++++++++---------
 lib/mailman/smtp_config.ex           |  1 +
 2 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/lib/mailman/external_smtp_adapter.ex b/lib/mailman/external_smtp_adapter.ex
index c6b3f22..f9e757e 100644
--- a/lib/mailman/external_smtp_adapter.ex
+++ b/lib/mailman/external_smtp_adapter.ex
@@ -7,16 +7,6 @@ defmodule Mailman.ExternalSmtpAdapter do
   Delivers an email based on specified config.
   """
   def deliver(config, email, message) do
-    relay_config = [
-      relay: config.relay,
-      username: config.username,
-      password: config.password,
-      port: config.port,
-      ssl: config.ssl,
-      tls: config.tls,
-      auth: config.auth
-    ]
-
     from_envelope_address = email.from
     to_envelope_address = email.to
 
@@ -27,7 +17,7 @@ defmodule Mailman.ExternalSmtpAdapter do
           to_envelope_address,
           message
         },
-        relay_config
+        build_relay_config(config)
       )
 
     case ret do
@@ -36,4 +26,29 @@ defmodule Mailman.ExternalSmtpAdapter do
       _ -> {:ok, message}
     end
   end
+
+  defp build_relay_config(%{hostname: nil} = config) do
+    [
+      relay: config.relay,
+      username: config.username,
+      password: config.password,
+      port: config.port,
+      ssl: config.ssl,
+      tls: config.tls,
+      auth: config.auth
+    ]
+  end
+
+  defp build_relay_config(config) do
+    [
+      relay: config.relay,
+      username: config.username,
+      password: config.password,
+      port: config.port,
+      ssl: config.ssl,
+      tls: config.tls,
+      auth: config.auth,
+      hostname: config.hostname
+    ]
+  end
 end
diff --git a/lib/mailman/smtp_config.ex b/lib/mailman/smtp_config.ex
index 0bef818..a1c1fde 100644
--- a/lib/mailman/smtp_config.ex
+++ b/lib/mailman/smtp_config.ex
@@ -10,6 +10,7 @@ defmodule Mailman.SmtpConfig do
     port: 1111,
     ssl: false,
     tls: :never,
+    hostname: nil,
     auth: :always
 
 end