In the Spampanel web interface we have a "Report Spam" function. You can upload a spam message to train the spamfilter. It is in a 'drag 'n' drop' style feature meaning you can save the SPAM email to your system, then drag and drop the email into the "Report Spam" area. Note that only emails are accepted that have been processed by the cluster you're reporting to. Currently only the .eml format is supported.
For .msg format you can use the free "Outlook Email client add-on" to report spam which was not correctly blocked by our systems. More information about these can be found here.
If you're using Thunderbird you can also use the free "Mozilla Thunderbird client addon". More information about this addon can be found here.
If your email client is not supported, for example Apple Mail.app, it is possible to report spam by forwarding the spam email(s) as attachment to a special address email@example.com . All messages attached in .eml format will be processed by this system.
Finally it's possible to report spam via our special IMAP system. We have instructions for Thunderbird and Outlook.