example: return email id from smtp response (#21)

Author: drish

Gemfile

@@ -4,7 +4,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby ">3.0"
 
 # Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main"
-gem "rails", "~> 7.1.0"
+gem "rails", "~> 7.0.0"
 
 # Use sqlite3 as the database for Active Record
 gem "sqlite3", "~> 1.4"

Gemfile.lock

@@ -1,99 +1,85 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (7.1.3.2)
-      actionpack (= 7.1.3.2)
-      activesupport (= 7.1.3.2)
+    actioncable (7.0.4)
+      actionpack (= 7.0.4)
+      activesupport (= 7.0.4)
       nio4r (~> 2.0)
       websocket-driver (>= 0.6.1)
-      zeitwerk (~> 2.6)
-    actionmailbox (7.1.3.2)
-      actionpack (= 7.1.3.2)
-      activejob (= 7.1.3.2)
-      activerecord (= 7.1.3.2)
-      activestorage (= 7.1.3.2)
-      activesupport (= 7.1.3.2)
+    actionmailbox (7.0.4)
+      actionpack (= 7.0.4)
+      activejob (= 7.0.4)
+      activerecord (= 7.0.4)
+      activestorage (= 7.0.4)
+      activesupport (= 7.0.4)
       mail (>= 2.7.1)
       net-imap
       net-pop
       net-smtp
-    actionmailer (7.1.3.2)
-      actionpack (= 7.1.3.2)
-      actionview (= 7.1.3.2)
-      activejob (= 7.1.3.2)
-      activesupport (= 7.1.3.2)
+    actionmailer (7.0.4)
+      actionpack (= 7.0.4)
+      actionview (= 7.0.4)
+      activejob (= 7.0.4)
+      activesupport (= 7.0.4)
       mail (~> 2.5, >= 2.5.4)
       net-imap
       net-pop
       net-smtp
-      rails-dom-testing (~> 2.2)
-    actionpack (7.1.3.2)
-      actionview (= 7.1.3.2)
-      activesupport (= 7.1.3.2)
-      nokogiri (>= 1.8.5)
-      racc
-      rack (>= 2.2.4)
-      rack-session (>= 1.0.1)
+      rails-dom-testing (~> 2.0)
+    actionpack (7.0.4)
+      actionview (= 7.0.4)
+      activesupport (= 7.0.4)
+      rack (~> 2.0, >= 2.2.0)
       rack-test (>= 0.6.3)
-      rails-dom-testing (~> 2.2)
-      rails-html-sanitizer (~> 1.6)
-    actiontext (7.1.3.2)
-      actionpack (= 7.1.3.2)
-      activerecord (= 7.1.3.2)
-      activestorage (= 7.1.3.2)
-      activesupport (= 7.1.3.2)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.2.0)
+    actiontext (7.0.4)
+      actionpack (= 7.0.4)
+      activerecord (= 7.0.4)
+      activestorage (= 7.0.4)
+      activesupport (= 7.0.4)
       globalid (>= 0.6.0)
       nokogiri (>= 1.8.5)
-    actionview (7.1.3.2)
-      activesupport (= 7.1.3.2)
+    actionview (7.0.4)
+      activesupport (= 7.0.4)
       builder (~> 3.1)
-      erubi (~> 1.11)
-      rails-dom-testing (~> 2.2)
-      rails-html-sanitizer (~> 1.6)
-    activejob (7.1.3.2)
-      activesupport (= 7.1.3.2)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.1, >= 1.2.0)
+    activejob (7.0.4)
+      activesupport (= 7.0.4)
       globalid (>= 0.3.6)
-    activemodel (7.1.3.2)
-      activesupport (= 7.1.3.2)
-    activerecord (7.1.3.2)
-      activemodel (= 7.1.3.2)
-      activesupport (= 7.1.3.2)
-      timeout (>= 0.4.0)
-    activestorage (7.1.3.2)
-      actionpack (= 7.1.3.2)
-      activejob (= 7.1.3.2)
-      activerecord (= 7.1.3.2)
-      activesupport (= 7.1.3.2)
+    activemodel (7.0.4)
+      activesupport (= 7.0.4)
+    activerecord (7.0.4)
+      activemodel (= 7.0.4)
+      activesupport (= 7.0.4)
+    activestorage (7.0.4)
+      actionpack (= 7.0.4)
+      activejob (= 7.0.4)
+      activerecord (= 7.0.4)
+      activesupport (= 7.0.4)
       marcel (~> 1.0)
-    activesupport (7.1.3.2)
-      base64
-      bigdecimal
+      mini_mime (>= 1.1.0)
+    activesupport (7.0.4)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      connection_pool (>= 2.2.5)
-      drb
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
-      mutex_m
       tzinfo (~> 2.0)
-    base64 (0.2.0)
-    bigdecimal (1.4.4)
     bootsnap (1.18.3)
       msgpack (~> 1.2)
-    builder (3.2.4)
+    builder (3.3.0)
     coderay (1.1.3)
-    concurrent-ruby (1.2.3)
-    connection_pool (2.4.1)
+    concurrent-ruby (1.3.3)
     crass (1.0.6)
     date (3.3.4)
     debug (1.9.1)
       irb (~> 1.10)
       reline (>= 0.3.8)
-    drb (2.2.0)
-      ruby2_keywords
-    erubi (1.12.0)
+    erubi (1.13.0)
     globalid (1.2.1)
       activesupport (>= 6.1)
-    i18n (1.14.1)
+    i18n (1.14.5)
       concurrent-ruby (~> 1.0)
     io-console (0.7.2)
     irb (1.11.2)
@@ -107,25 +93,22 @@ GEM
       net-imap
       net-pop
       net-smtp
-    marcel (1.0.2)
+    marcel (1.0.4)
     method_source (1.0.0)
     mini_mime (1.1.5)
-    minitest (5.22.2)
+    minitest (5.23.1)
     msgpack (1.7.2)
-    mutex_m (0.2.0)
-    net-imap (0.4.10)
+    net-imap (0.4.12)
       date
       net-protocol
     net-pop (0.1.2)
       net-protocol
     net-protocol (0.2.2)
       timeout
-    net-smtp (0.4.0.1)
+    net-smtp (0.5.0)
       net-protocol
     nio4r (2.7.0)
-    nokogiri (1.16.2-x86_64-darwin)
-      racc (~> 1.4)
-    nokogiri (1.16.2-x86_64-linux)
+    nokogiri (1.16.6-arm64-darwin)
       racc (~> 1.4)
     pry (0.14.2)
       coderay (~> 1.1)
@@ -134,64 +117,58 @@ GEM
       stringio
     puma (6.4.2)
       nio4r (~> 2.0)
-    racc (1.7.3)
+    racc (1.8.0)
     rack (2.2.8.1)
-    rack-session (1.0.2)
-      rack (< 3)
     rack-test (2.1.0)
       rack (>= 1.3)
-    rackup (1.0.0)
-      rack (< 3)
-      webrick
-    rails (7.1.3.2)
-      actioncable (= 7.1.3.2)
-      actionmailbox (= 7.1.3.2)
-      actionmailer (= 7.1.3.2)
-      actionpack (= 7.1.3.2)
-      actiontext (= 7.1.3.2)
-      actionview (= 7.1.3.2)
-      activejob (= 7.1.3.2)
-      activemodel (= 7.1.3.2)
-      activerecord (= 7.1.3.2)
-      activestorage (= 7.1.3.2)
-      activesupport (= 7.1.3.2)
+    rails (7.0.4)
+      actioncable (= 7.0.4)
+      actionmailbox (= 7.0.4)
+      actionmailer (= 7.0.4)
+      actionpack (= 7.0.4)
+      actiontext (= 7.0.4)
+      actionview (= 7.0.4)
+      activejob (= 7.0.4)
+      activemodel (= 7.0.4)
+      activerecord (= 7.0.4)
+      activestorage (= 7.0.4)
+      activesupport (= 7.0.4)
       bundler (>= 1.15.0)
-      railties (= 7.1.3.2)
+      railties (= 7.0.4)
     rails-dom-testing (2.2.0)
       activesupport (>= 5.0.0)
       minitest
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.6.0)
       loofah (~> 2.21)
       nokogiri (~> 1.14)
-    railties (7.1.3.2)
-      actionpack (= 7.1.3.2)
-      activesupport (= 7.1.3.2)
-      irb
-      rackup (>= 1.0.0)
+    railties (7.0.4)
+      actionpack (= 7.0.4)
+      activesupport (= 7.0.4)
+      method_source
       rake (>= 12.2)
-      thor (~> 1.0, >= 1.2.2)
-      zeitwerk (~> 2.6)
-    rake (13.1.0)
+      thor (~> 1.0)
+      zeitwerk (~> 2.5)
+    rake (13.2.1)
     rdoc (6.6.2)
       psych (>= 4.0.0)
     reline (0.4.2)
       io-console (~> 0.5)
-    ruby2_keywords (0.0.5)
+    sqlite3 (1.6.2-arm64-darwin)
     sqlite3 (1.6.2-x86_64-darwin)
     sqlite3 (1.6.2-x86_64-linux)
     stringio (3.1.0)
-    thor (1.3.0)
+    thor (1.3.1)
     timeout (0.4.1)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    webrick (1.8.1)
     websocket-driver (0.7.6)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
-    zeitwerk (2.6.13)
+    zeitwerk (2.6.15)
 
 PLATFORMS
+  arm64-darwin-22
   x86_64-darwin-20
   x86_64-darwin-21
   x86_64-linux
@@ -201,7 +178,7 @@ DEPENDENCIES
   debug
   pry
   puma (~> 6.0)
-  rails (~> 7.1.0)
+  rails (~> 7.0.0)
   sqlite3 (~> 1.4)
   tzinfo-data
 

app/controllers/user_controller.rb

@@ -3,8 +3,12 @@ class UserController < ApplicationController
   def send_hello_email
     @user = User.new(name: "derich")
 
-    r = UserMailer.with(user: @user).welcome_email.deliver!
-    render json: {status: 'ok'}
+    # Make sure return_response is set to true in the SMTP smtp_settings object
+    # so that we get an Net::SMTP::Response object here.
+    smtp_response = UserMailer.with(user: @user).welcome_email.deliver!
+    render json: {
+      email_id: smtp_response.message.split(" ")[1].strip
+    }
   end
 
   def healthz

app/mailers/application_mailer.rb

@@ -1,4 +1,4 @@
 class ApplicationMailer < ActionMailer::Base
-  default from: "[email protected]"
+  default from: "[email protected]"
   layout "mailer"
 end

app/mailers/user_mailer.rb

@@ -1,15 +1,13 @@
 class UserMailer < ApplicationMailer
   # this domain must be verified with Resend
-  default from: "[email protected]"
+  default from: "[email protected]"
 
   def welcome_email
     @user = params[:user]
     attachments["invoice.pdf"] = File.read(Rails.root.join("resources","invoice.pdf"))
     @url  = "http://example.com/login"
     mail(
-      to: ["[email protected]"],
-      cc: ["[email protected]"],
-      bcc: ["[email protected]"],
+      to: ["[email protected]"],
       reply_to: "[email protected]",
       subject: "Hello from Rails",
     )

config/environments/development.rb

@@ -60,6 +60,7 @@
     :port      => 465,
     :user_name => 'resend',
     :password  => ENV['RESEND_API_KEY'],
+    :return_response => true,
     :tls => true
   }
   # Raises error for missing translations.