The Sender Blacklist allows you blacklist emails from specific senders or domains.
The list is available under in the left navigation pane.
You can enable or disable the Sender Blacklist test by clicking the ON / OFF button on top of the page, or on the page.
Select the "Blacklist only the list below" option if you want to blacklist emails only from those senders that are present on the list. If you want to blacklist every emails, except from those senders that are on the sender blacklist, select "Blacklist all addresses, except the list below".
Click the New button to add an email address or email address expression to the list. To modify an existing email address expression, click Modify or hit Enter. Email address expressions can be deleted using the Delete button or the Delete key.
Click the column header of any column by which you wish to sort the Sender Blacklist. To reverse sorting, click the column header again.
Right-click on the list and select "Import list..." or "Export list...". Alternatively, you can do this from the menu, select or .
Right-click on the list item or items and select "Search in logs..." to find log records that match the defined expression. Logs need to be loaded in the Log Viewer beforehand.
RFC standards require fully qualified domain name in the sender email addresses on SMTP transport level (otherwise no reply could be sent). Tick this checkbox to blacklist emails from senders who do not satisfy this criteria.
ORF works with the SMTP envelope sender address submitted during SMTP transport, while email clients like Microsoft® Outlook® show the Author (aka. MIME) sender address only stored in the email header, so make sure you are blacklisting the right email address.
The SMTP envelope and author information matches in most cases, but spammers often use different SMTP envelope and author information to confuse the recipient. It is absolutely legal to use different SMTP envelope and author address information. The Bcc: addressing, mailing lists, CRM software and other systems with automatic bounce-handling also often take advantage of this. For example, Yahoo mailing lists handle bounces automatically and their notifications are sent with SMTP envelope email addresses like [email protected] – the email client reports whoever that the email was sent by [email protected].
If you wish to blacklist the Author address displayed in the email client instead of the SMTP envelope sender address, you could do so by adding a filter expression with a Header field: From search scope to the Keyword Blacklist.
Note that the "." (dot) character in regular expressions should be escaped by adding a preceding "\" (backslash).