How do junk mail digests work?
Junk mail digests allow you to quickly review the messages that the spam filter has classified as junk mail, and help you to be certain that no legitimate emails are lost. The junk mail digests show the From address and subject line of every message detected as junk mail; they also include a link next to each message that allows you to immediately release any message from quarantine that is legitimate or potentially legitimate.
You can receive a junk mail digest at an interval of your discretion (i.e. every Monday and Friday, every week day, etc.). Note that the digest will contain the messages from the time period since your last digest; for example, if you receive a digest every weekday, the digest on Monday will include all of the messages sent since the digest was generated on Friday.
Junk mail digests can be enabled and configured on the Management > Inbound Filtering > Digests page.
I have junk mail digests enabled, but have not been receiving my digests. Where are they?
Disappearing junk mail digests are most often caused by spam filtering protocols on a company's mail server or individual workstations. Because of the "spammy" subject lines and From addresses that are included in the digest messages, many secondary filtering programs often think that the digest themselves are spam. While there are many potential secondary filtering programs, with varying degrees of customizability, in general the best way to avoid this problem is to whitelist (allow) the IP addresses of the spam filtering servers and/or the "From" address of the digest messages.