Replace SendGrid SMTP with Resend for transactional email

Gemfile

@@ -60,6 +60,7 @@ gem "valid_email2"
 gem "importmap-rails"
 gem "tailwindcss-rails", "~> 3.0"
 gem "rack-attack"
+gem "resend"
 # Fix LoadError: cannot load such file -- csv
 gem "csv", "~> 3.3"
 

Gemfile.lock

@@ -177,6 +177,10 @@ GEM
     globalid (1.3.0)
       activesupport (>= 6.1)
     hashdiff (1.2.1)
+    httparty (0.24.2)
+      csv
+      mini_mime (>= 1.0.0)
+      multi_xml (>= 0.5.2)
     i18n (1.14.8)
       concurrent-ruby (~> 1.0)
     image_processing (1.14.0)
@@ -244,6 +248,8 @@ GEM
       stimulus-rails
       turbo-rails
     msgpack (1.8.0)
+    multi_xml (0.8.1)
+      bigdecimal (>= 3.1, < 5)
     net-imap (0.6.3)
       date
       net-protocol
@@ -353,6 +359,8 @@ GEM
     regexp_parser (2.11.3)
     reline (0.6.3)
       io-console (~> 0.5)
+    resend (1.0.1)
+      httparty (>= 0.21.0)
     responders (3.2.0)
       actionpack (>= 7.0)
       railties (>= 7.0)
@@ -507,6 +515,7 @@ DEPENDENCIES
   rack-attack
   rack-cors
   rails (~> 8.1)
+  resend
   rubocop-rails-omakase
   seed-fu (~> 2.3)
   selenium-webdriver (>= 4.20.1)

config/credentials/production.yml.enc

@@ -1 +1 @@
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--B/B8n61Uakp5ANZk--gMDyaxxROS024p6FHcY8rQ==

config/credentials/staging.yml.enc

@@ -1 +1 @@
-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--SteN2xYjnwV6iyoT--ICfaAYgEkHXmyFHnzByPxg==
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--tD4uvk6CpSfFWXB2--wCTBHN+O0ztIpU8++9fGqw==

config/initializers/mail.rb

@@ -6,20 +6,7 @@
     ActionMailer::Base.default_url_options[:host] = ConfigSettings.app.domain
     ActionMailer::Base.default_url_options[:protocol] = "https"
 
-    shared_settings = {
-      port: 587,
-      authentication: :plain,
-      enable_starttls_auto: true,
-      domain: ConfigSettings.site.domain
-    }
-
-    settings = {
-      address: Rails.application.credentials.dig(:smtp, :host),
-      domain: Rails.application.credentials.dig(:smtp, :domain),
-      user_name: Rails.application.credentials.dig(:smtp, :username),
-      password: Rails.application.credentials.dig(:smtp, :password)
-    }.merge(shared_settings)
-
-    ActionMailer::Base.smtp_settings.merge!(settings)
+    ActionMailer::Base.delivery_method = :resend
+    Resend.api_key = Rails.application.credentials.dig(:resend, :api_key)
   end
 end

lib/templates/rails/credentials/credentials.yml.tt

@@ -7,9 +7,6 @@ active_record_encryption:
   deterministic_key: <%= SecureRandom.alphanumeric(32) %>
   key_derivation_salt: <%= SecureRandom.alphanumeric(32) %>
 
-# SMTP
-smtp:
-  host:
-  domain:
-  username:
-  password:
+# Resend
+resend:
+  api_key: