Why Can't I Delete / Mark Messages as Read in Mimecast?

Document created by user.oxriBaJeN4 Employee on Sep 7, 2015Last modified by user.oxriBaJeN4 Employee on Apr 17, 2018
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This article outlines why messages cannot be deleted or marked as read in Mimecast.


Applies To...


  • End users of Mimecast applications




"Why can't emails be deleted or marked as read?" This is one of the most frequently asked questions we receive at Mimecast. Usually these are received from users of Mimecast Mobile, but we also see users of Mimecast for Outlook and Mimecast Personal Portal ask this also. Let's use Mimecast Mobile as our example to outline why this isn't a feature in Mimecast.


Mailbox Storage Management


As a view of your email archive, Mimecast displays all messages received for an end user. This is regardless of whether these have been deleted from your corporate environment. Microsoft Exchange is the most common mail server used by Mimecast customers. Storage for email stored in Microsoft Exchange is expensive. You've probably heard your IT department say they're archiving much of your email. Some IT departments delete all email after six months. This is where Mimecast becomes really useful, even though your organisation doesn't have the email any longer. You can still search for it using Mimecast applications, returning results in seconds. With all your data safely stored in Mimecast, your IT departments no longer need to worry about costly maintenance of on-site hardware or increasing storage costs.




Alternatively if you've ever heard the IT department say "email is down!", Mimecast Mobile can help you here too. Mimecast is still delivering all your messages whether that's inbound (when receiving messages from other companies) or outbound (when you sending messages out to other companies). When your Microsoft Exchange server comes back online again, Mimecast delivers all of the messages to it allowing you to see them in Outlook.



Email won't be deleted from Mimecast, as your administrators may have legal requirements to fulfill around the retention of these items. If a message is accidentally deleted from your Outlook profile, Mimecast allows you to recover it back into Outlook. Marking an email as read, means Mimecast would need to update each message for each customer, and send updates regarding email status back to the Microsoft Exchange server. This isn't currently possible. As soon as it is, we'll add this feature into our applications.

The next time you open up Mimecast Mobile, you're taking a look at every email you have in Mimecast. All of it can be searched quickly, even those lengthy word documents you received.


General Data Protection Regulation (GDPR) Compliance


General Data Protection Regulation (GDPR) is a regulatory requirement designed to:

  • Harmonize data privacy laws across Europe.
  • Protect and empower all EU citizens data privacy.
  • Reshape the way organizations across the region approach data privacy.


It isn't an end user function. All GDPR requests must be directed to your administrator. See the General Data Protection Regulation (GDPR): Configuring Mimecast page for full details.