fix: repaired smtp configuration for port 587

lib/mv/mailer.ex

@@ -111,7 +111,7 @@ defmodule Mv.Mailer do
           do: :verify_peer,
           else: :verify_none
 
-      [
+      base_opts = [
         adapter: Swoosh.Adapters.SMTP,
         relay: host,
         port: port,
@@ -120,11 +120,20 @@ defmodule Mv.Mailer do
         auth: :always,
         username: username,
         password: password,
-        # tls_options: STARTTLS (587); sockopts: direct SSL (465). Verify from :smtp_verify_peer (ENV SMTP_VERIFY_PEER).
-        tls_options: [verify: verify_mode],
-        sockopts: [verify: verify_mode]
+        # tls_options: used for STARTTLS (587). For 465, gen_smtp uses sockopts for initial ssl:connect.
+        tls_options: [verify: verify_mode]
       ]
-      |> Enum.reject(fn {_k, v} -> is_nil(v) end)
+
+      # Port 465: initial connection is ssl:connect; pass verify in sockopts so server cert is not required.
+      # Port 587: initial connection is gen_tcp; sockopts must NOT contain verify (gen_tcp rejects it).
+      opts =
+        if ssl_mode == "ssl" do
+          Keyword.put(base_opts, :sockopts, verify: verify_mode)
+        else
+          base_opts
+        end
+
+      opts |> Enum.reject(fn {_k, v} -> is_nil(v) end)
     else
       []
     end