chore: Handle invalid email address in IMAP channel

app/mailboxes/imap/imap_mailbox.rb

@@ -12,6 +12,9 @@ def process(mail, channel)
     # prevent loop from chatwoot notification emails
     return if notification_email_from_chatwoot?
 
+    # Stop processing if email format doesn't match Chatwoot supported mail format
+    return unless email_from_valid_email?
+
     ActiveRecord::Base.transaction do
       find_or_create_contact
       find_or_create_conversation
@@ -34,6 +37,18 @@ def decorate_mail
     @processed_mail = MailPresenter.new(@inbound_mail, @account)
   end
 
+  def email_from_valid_email?
+    Rails.logger.info("Processing Email from: #{@processed_mail.original_sender} : inbox #{@inbox.id}")
+
+    # validate email with  Devise.email_regexp
+    if Devise.email_regexp.match?(@processed_mail.original_sender)
+      true
+    else
+      Rails.logger.error("Email from: #{@processed_mail.original_sender} : inbox #{@inbox.id} is invalid")
+      false
+    end
+  end
+
   def find_conversation_by_in_reply_to
     return if in_reply_to.blank?
 

spec/mailboxes/imap/imap_mailbox_spec.rb

@@ -54,6 +54,16 @@
       end
     end
 
+    context 'when a new email with invalid from' do
+      let(:inbound_mail) { create_inbound_email_from_mail(from: 'invalidemail', to: 'imap@gmail.com', subject: 'Hello!') }
+
+      it 'does not create a new conversation' do
+        allow(Rails.logger).to receive(:error)
+        class_instance.process(inbound_mail.mail, channel)
+        expect(Rails.logger).to have_received(:error).with("Email from: invalidemail : inbox #{inbox.id} is invalid")
+      end
+    end
+
     context 'when a reply for existing email conversation' do
       let(:prev_conversation) { create(:conversation, account: account, inbox: channel.inbox, assignee: agent) }
       let(:reply_mail) do