Maybe the sending server has been graylisted or is on a blacklist for some reason. Sometimes legitimate emails get blocked, and you may need to investigate why. It gives you access to a dashboard where you can release or delete spam or other emails. I have been playing around with ESET Mail Security for Exchange, and it comes with a built-in quarantine system. Shutterstock Exchange spam and mailbox quarantines Having admins handle the email quarantine will allow them to examine the sender and see why it was blocked and either release the email or deny it. Teaching end-users to manage their own quarantines is a big process, as some mails look legit - and this is where you get caught with malware. From fake bank statements to adverts to some really strange emails getting filtered, and as an admin, you can blacklist the email or domain and have a layer of protection in place. When the spam filters are set up and configured fully, you will be amazed at how much nonsense gets blocked daily that is sent to end-users. Having a spam filter in place also protects you against phishing emails and all the junk sent on an hourly basis. Spam has been increasing extensively, and if you not careful, end-users can click on links that will introduce malware and viruses into your system. If you running any version of Exchange, you may be using the standard spam filter or one in the cloud such as Exchange Online Protection, GFI MailEssentials, Mimecast, Symantec, or the hardware types like Barracuda, to name just a few.
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