Exim stop Newsletter crap

local_sender_blacklist
This is a onboard exim possibility to blacklist special addresses, its only a optional file which contains a list of envelope senders whose messages will be denied;

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550-sender envelope address noreply@rustock.net is locally blacklisted here

Example of content:

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cat /etc/exim4/local_sender_blacklist
noreply@rustock.net
parker.ball@freeemailservice.info

Restart or reload of exim is not required.