I was having a look at the daily mail report sent to the admin account, and I found that there is always a discrepancy in the total count of sent/received messages to our domain. The grand totals tells that 16747 messages were received and 31069 delivered; the most "sent to" domain (Host/Domain Summary: Message Delivery table) is our domain with 22386 mails, that is also the most "received from" (Host/Domain Summary: Messages Received table) too, but only with 4366. Why there is such difference? The number of emails sent to and received from our domain should not be equal?
Thank you in advance