I have added
^X-Mailer: (?!Microsoft Outlook .*)$
as the first rule and set to Hold according to your instructions.
I tried to block all mails except the mails from MS Outlook. However today, I received an email with header like:
X-Mailer: Microsoft CDO for Windows 2000
I couldn't understand why this header did not go to pending moderator requests.
On 01/30/2013 12:33 AM, Mark Sapiro wrote:
METU E-List Admin wrote:
In some of our lists, we are receiving excessive spam messages. We analyzed the spam messages and found that they have similar headers. As a result, we developed the following list:
^X-Mailer: (?!Microsoft Outlook .*)$ ^X-mailer: .*$ This includes the one above it.
^X-Mailer-LID: .*$ ^X-Mailer-RecptId: .*$ ^X-Mailer-SID: .*$ ^X-Mailer-Sent-By: .*$ ^X-Spam-Status: Yes.*$ ^X-Spam-Flag: YES ^X-Virus-Status: Yes
We don't want to receive any mails from external mail systems, only real persons can send emails.
We enter this list to the bounce_matching_headers part (in the admin panel, under Spam Filtering).
bounce_matching_headers doesn't work that way. See the '(Details for bounce_matching_headers' link.
Regexps like the above should go in header_filter_rules with an appropriate action.