Feat: Support for Microsoft Oauth in Email Channel (#6227)

- Adds the backend APIs required for Microsoft Email Channels

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>
Co-authored-by: Sojan <sojan@pepalo.com>

spec/mailers/conversation_reply_mailer_spec.rb

@@ -170,6 +170,22 @@ RSpec.describe ConversationReplyMailer, type: :mailer do
       end
     end
 
+    context 'when smtp enabled for microsoft email channel' do
+      let(:ms_smtp_email_channel) do
+        create(:channel_email, imap_login: 'smtp@outlook.com',
+                               imap_enabled: true, account: account, provider: 'microsoft', provider_config: { access_token: 'access_token' })
+      end
+      let(:conversation) { create(:conversation, assignee: agent, inbox: ms_smtp_email_channel.inbox, account: account).reload }
+      let(:message) { create(:message, conversation: conversation, account: account, message_type: 'outgoing', content: 'Outgoing Message 2') }
+
+      it 'use smtp mail server' do
+        mail = described_class.email_reply(message)
+        expect(mail.delivery_method.settings.empty?).to be false
+        expect(mail.delivery_method.settings[:address]).to eq 'smtp.office365.com'
+        expect(mail.delivery_method.settings[:port]).to eq 587
+      end
+    end
+
     context 'when smtp disabled for email channel', :test do
       let(:conversation) { create(:conversation, assignee: agent, inbox: email_channel.inbox, account: account).reload }
       let(:message) { create(:message, conversation: conversation, account: account, message_type: 'outgoing', content: 'Outgoing Message 2') }