Email that is deleted as Spam (or any other category you've chosen to block) is placed in a deleted mail folder and held on our servers for 7 days.
Administrators can review these messages through the "View Deleted Email" menu in the Support site. You can (and really should) enable the automatic sending of daily "SpamReports" to each of your email addresses so that your end-users may receive these reports directly.
Your end-users can also generate SpamReports in real-time by submitting their email address through the "On-Demand" page at: https://www.onlymyemail.com/spamreport/.
Regardless of which method is being used the "Subject:" of each message displayed is a hyper-link that can be used to open a copy of the original. Included in the display of this copy is a "Resend" button which will re-deliver the original email to original destination address.
Once the resend is confirmed, users will be presented with the option of specifying whether future emails from that sender should be delivered.
This functionality means that while you may review and resend emails for any user, each user may also review the deleted email for just their address. More importantly, when an end-user specifies that certain senders should be allowed to deliver email to them in the future, this will not directly affect other users within your account.
