chore: Improve email parsing using email trimmer gem (#3611)

Email parsing using email_trimmer gem

Fixes: #3539 , #2954, #3572

spec/mailboxes/reply_mailbox_spec.rb

@@ -7,6 +7,7 @@ RSpec.describe ReplyMailbox, type: :mailbox do
     let(:account) { create(:account) }
     let(:agent) { create(:user, email: 'agent1@example.com', account: account) }
     let(:reply_mail) { create_inbound_email_from_fixture('reply.eml') }
+    let(:mail_with_quote) { create_inbound_email_from_fixture('mail_with_quote.eml') }
     let(:conversation) { create(:conversation, assignee: agent, inbox: create(:inbox, account: account, greeting_enabled: false), account: account) }
     let(:described_subject) { described_class.receive reply_mail }
     let(:serialized_attributes) do
@@ -95,5 +96,35 @@ RSpec.describe ReplyMailbox, type: :mailbox do
         expect(conversation_1.messages.last.content).to eq("Let's talk about these images:")
       end
     end
+
+    context 'with quotes in email' do
+      let(:described_subject) { described_class.receive mail_with_quote }
+
+      before do
+        # this UUID is hardcoded in the reply.eml, that's why we are updating this
+        conversation.uuid = '6bdc3f4d-0bec-4515-a284-5d916fdde489'
+        conversation.save
+      end
+
+      it 'add the mail content as new message on the conversation' do
+        described_subject
+        expect(conversation.messages.last.content).to eq(
+          <<-BODY.strip_heredoc.chomp
+            Yes, I am providing you step how to reproduce this issue
+
+            On Thu, Aug 19, 2021 at 2:07 PM Tejaswini from Email sender test < tejaswini@chatwoot.com> wrote:
+
+            > Any update on this?
+            >
+            >
+
+            --
+            * Sony Mathew*
+            Software developer
+            *Mob:9999999999
+          BODY
+        )
+      end
+    end
   end
 end