Setting up Content Control

You can set up Content Control. You can modify the default settings for the domain as well as the settings for single groups.

Content Control is activated.

  1. Log in to the Control Panel with your administrative credentials.
  2. Select a domain from the scope selection.
  3. Navigate to Security Settings > Content Control.
  4. Under Affected groups, choose whether you want to modify the default settings or the settings for a group.
    Figure 1: Selecting default or group settings
    • To modify the settings for all users of the domain which are not included in any of the listed groups, select Default.

    • To modify the settings for a group, select that group.

    Your selection is highlighted in green.

  5. Go to Settings > For incoming emails to set up Content Control for incoming emails.
  6. Note:

    Select a maximum email size that does not exceed the size limit of your mail server.

    Under Max. email size (MB), enter the maximum allowed email size in megabytes.
    Figure 2: Entering the maximum email size
    Note:

    The email size refers to the calculated payload of the email. It is an approximate value. The actual size, including additional data needed to transmit the email, may be greater.

  7. Click on Confirm to save the changes.
  8. Note:

    This option is only available for incoming emails. Outgoing emails with filtered out attachments are blocked and the sender receives a non-delivery report.

    Under Handling of filtered out attachments, select how to deal with emails with filtered out attachments.
    Figure 3: Select how to handle filtered out attachments
    • To save emails with filtered out attachments in the quarantine and prevent them from being delivered to the recipients, select Store emails in quarantine.

    • To cut filtered out attachments from the emails and deliver the emails with automatically generated attachments containing references to the removed attachments instead, select Cut attachment and inform recipients.

  9. Select which attachments should be filtered out. To filter out attachments, toggle the corresponding switch.
    Figure 4: Filtering out attachments
    • Select Filter out encrypted attachments with the following file extensions:

      • .dot
      • .doc
      • .docx
      • .xls
      • .xlsx
      • .ppt
      • .pptx
      • .pdf
      • .zip
      • .rar
      • .7z
      • .gz
    • Select Filter out executable attachments to filter out all file types from the category .executable (see Overview of Categories).

    • Select Filter out Excel documents with macros to filter out all file types from the category .xslmacro (see Overview of Categories).

    • Select Filter out Word documents with macros to filter out all file types from the category .docmacro (see Overview of Categories).

  10. Note:

    You can use categories to filter out groups of file types (see Overview of Categories).

    Important:

    Content Control does not only check the file extension but also checks the MIME type of the files. The MIME type can differ from the file extension.

    Figure 5: Example

    If you filter out .gz files, you also filter out files with the MIME type application/gz.

    In order to filter out files of other file types, enter the file extension in the field under Forbidden file extensions (e.g. '.jpg') (e.g., ".jpg") and click on Add.
    Figure 6: Filtering out file types

    The file type is listed below.

  11. Important:

    Content Control opens and scans archive files in the formats .rar, .zip, and 7z. Archive files in other formats are not checked. If archive files are nested, Content Control checks archive files up to the 4th level. On each level, Content Control checks a maximum of 8 archive files. For each email, Content Control checks a maximum of 1000 files inside archive files.

    To filter out files of certain file types from archive files, proceed as follows.
    • To use the file types listed above, mark the checkbox Inherit forbidden file extensions from above under Forbidden file extensions in archives (e.g. '.png').

    • In order to filter out files of other file types, enter the file extension in the field under Forbidden file extensions in archives (e.g. '.png') and click on Add.

  12. Go to For outgoing emails > Settings to set up Content Control for outgoing emails.
  13. Set up Content Control for outgoing emails.
    • To apply the settings of incoming emails to outgoing emails, toggle the switch Use the same settings as for incoming emails.

    • To make different settings for outgoing emails than for incoming emails, follow the same procedure as in the previous steps for incoming emails.

You have set up Content Control