|Emails that are bounce from other mail severs will have a from value of <>|
The filters are set to not block those emails.
If you still want those emails to be filtered, then run the following:
The filtering process includes the "SPAM Filters" and any email redirects for spamassassin.
SpamAssassin will still scan the emails, it would only be the redirection that is affected with the <> address.
If you wish to simply delete all emails with <> as the sender (note, this includes bounces and valid errors mail the mail system), add this to the top of your /etc/system_filter.exim file:
if $h_From: contains "<>"
|How to prevent bounce emails from leaving your server|
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