Knowledgebase
Spam Quarantine (web/IMAP)
Posted by Martin Helms on 04 November 2013 22:19
Table of Contents
  1. Webinterface access
  2. IMAP access
  3. IMAP folders

 

The quarantine system can be accessed directly via IMAP, or using the webinterface. Note that the use of the quarantine is optional, and not a necessity. Emails placed in quarantine have been rejected with a 5xx SMTP rejection code as SMTP level, so legitimate sending servers will have informed the sender about the rejection. Spam messages that were temporarily rejected at SMTP level are not listed in the quarantine, and will be automatically retried by legitimate sending servers.

Webinterface access

From the webinterface you can either delete or release messages blocked as spam. In case an email has been correctly blocked, clicking release will result in delivery of the false positive to the original recipient. It will also trigger a report about the wrong classification to our systems to further improve the filtering.

IMAP access

The quarantine system is powered by an IMAP backend. The backend is accessible as administrator (using the special "global" account), domain (using the domainname), and recipient (using the email address). Customers using the SpamExperts hosted cloud can connect to quarantine.antispamcloud.com. Users on a SpamExperts Local Cloud can use the hostname of the primary server in that cluster (or a CNAME associated with it). We have instructions available for Thunderbird and Outlook. Using IMAP you can also mass release specific emails. For Local Cloud users there  is also a special "global" account which can be used to retrieve IMAP access to all quarantined messages.

IMAP folders

There are several special folders present in the IMAP account:

  • Caught: All incoming messages which have been quarantined can be found in this folder. It's not necessary to report these emails as Spam again, as they have already been classified as such. These emails will automatically expire.
  • Caught (Outgoing): All outgoing messages which have been quarantined can be found in this folder (optional). It's not necessary to report these emails as Spam again, as they have already been classified as such. These emails will automatically expire.
  • Training Requested: This is only relevant if a special option as been activated via the Software API to store a copy of unsure classifications in this folder. These messages have been delivered, but can be manually dragged/dropped to "Not Spam" or "Spam" to further fine-tune the systems.
  • Release: This is a write-only folder (which cannot be accessed by the email client). Emails drag/dropped from "Caught" to this folder will be delivered to the recipient and reported as a classification mistake to our central systems
  • Not Spam: This is a write-only folder (which cannot be accessed by the email client). Emails drag/dropped from "Caught" or "Training Requested" to this folder will be reported as a classification mistake to our central systems (it will not be delivered to the recipient)
  • Spam: This is a write-only folder (which cannot be accessed by the email client). Emails drag/dropped to this folder will be reported as a Spam to our central systems (it will not be delivered to the recipient). This is useful to report spam which was not blocked correctly directly from the email client.
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