HosPortal offers users the ability to check historical email and SMS messages sent through HosPortal. Navigate to the Notify page and select "Track" (A):
Using this will allow each user to see a calendar listing the number of distinct SMS or Email messages that they have sent on each day (B), and for each message selected you will be able to see:
the message content (C)
the names of each of the recipients (D)
whether the message was received by each recipient (D)
Note that it is not currently possible to track emails and SMS messages sent under someone else's account. You will need to contact the sender to get them to review the Track function.