chore: Disable throwing error for malformed to address (#10464)

We don't need to raise error on sentry for malformed to address as it is already logged.

Fixes: https://linear.app/chatwoot/issue/CW-3151/standarderror-invalid-email-to-address-header-standarderror

app/mailboxes/application_mailbox.rb

@@ -8,12 +8,12 @@ class ApplicationMailbox < ActionMailbox::Base
 
   # routes as a reply to existing conversations
   routing(
-    ->(inbound_mail) { reply_uuid_mail?(inbound_mail) || in_reply_to_mail?(inbound_mail) } => :reply
+    ->(inbound_mail) { valid_to_address?(inbound_mail) && (reply_uuid_mail?(inbound_mail) || in_reply_to_mail?(inbound_mail)) } => :reply
   )
 
   # routes as a new conversation in email channel
   routing(
-    ->(inbound_mail) { EmailChannelFinder.new(inbound_mail.mail).perform.present? } => :support
+    ->(inbound_mail) { valid_to_address?(inbound_mail) && EmailChannelFinder.new(inbound_mail.mail).perform.present? } => :support
   )
 
   # catchall
@@ -37,8 +37,6 @@ class ApplicationMailbox < ActionMailbox::Base
     # checks if follow this pattern  send it to reply_mailbox
     # reply+<conversation-uuid>@<mailer-domain.com>
     def reply_uuid_mail?(inbound_mail)
-      validate_to_address(inbound_mail)
-
       inbound_mail.mail.to&.any? do |email|
         conversation_uuid = email.split('@')[0]
         conversation_uuid.match?(REPLY_EMAIL_UUID_PATTERN)
@@ -48,13 +46,12 @@ class ApplicationMailbox < ActionMailbox::Base
     # if mail.to returns a string, then it is a malformed `to` header
     # valid `to` header will be of type Mail::AddressContainer
     # validate if the to address is of type string
-    def validate_to_address(inbound_mail)
+    def valid_to_address?(inbound_mail)
       to_address_class = inbound_mail.mail.to&.class
-
-      return if to_address_class == Mail::AddressContainer
+      return true if to_address_class == Mail::AddressContainer
 
       Rails.logger.error "Email to address header is malformed `#{inbound_mail.mail.to}`"
-      raise StandardError, "Invalid email to address header #{inbound_mail.mail.to}"
+      false
     end
   end
 end

spec/mailboxes/application_mailbox_spec.rb

@@ -69,18 +69,26 @@ RSpec.describe ApplicationMailbox do
     end
 
     describe 'Invalid Mail To Address' do
-      it 'raises error when mail.to header is malformed' do
-        expect do
-          described_class.route mail_with_invalid_to_address
-        end.to raise_error(StandardError,
-                           'Invalid email to address header <vishnu@chatwoot.com>vishnu@chatwoot.com')
+      let(:logger) { double }
+
+      before do
+        allow(Rails).to receive(:logger).and_return(logger)
+        allow(logger).to receive(:error)
       end
 
-      it 'raises another error when mail.to header is malformed' do
+      it 'will not raise error when mail.to header is malformed format 1' do
+        expect(logger).to receive(:error).with("Email to address header is malformed `#{mail_with_invalid_to_address.mail.to}`")
+        expect do
+          described_class.route mail_with_invalid_to_address
+        end.not_to raise_error
+      end
+
+      it 'will not raise error when mail.to header is malformed format 2' do
+        expect(logger).to receive(:error).with("Email to address header is malformed `#{mail_with_invalid_to_address_2.mail.to}`")
+
         expect do
           described_class.route mail_with_invalid_to_address_2
-        end.to raise_error(StandardError,
-                           'Invalid email to address header vishnu@chatwoot.com www.chatwoot.com')
+        end.not_to raise_error
       end
     end
   end