Keyword based custom subject warning

[Benny Pedersen]

On 2022-03-07 10:41, Danilo Godec wrote:

> apparently, our users are receiving emails containing links and /or
> references to various publications, some of which are considered
> 'predatory'. Emails usually contain ISSN (International Standard
> Serial Number) and the idea is to scan the body of an email for the
> ISSN and if it matches one on the 'blacklist', the subject of the
> email should be prepended with some specific warning (other than
> ***SPAM***).
> 
> We're already using Amavisd-new on our inbound SMTP server, so I
> wonder if that would be possible with it?

amavisd is not a content filter, its a content controller, what is the 
diffrent ?

the issn would be a spamassassin plugin to that specific needs, is there 
a dns based host that provide data ?, what data anyway ?

would that blacklist be local or external ?