Keyword based custom subject warning

[Dominic Raferd]

On 07/03/2022 11:12, Damian 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?
>
> This would have been a use-case for [1]. The corresponding Amavis 
> feature is still unreleased, unfortunately.
>
> [1] 
> https://spamassassin.apache.org/full/3.4.x/doc/Mail_SpamAssassin_Conf.html#subjprefix
>
Good call. But if Amavis is calling SA (which is normal) this feature in 
SA can still be used can't it? As Benny has pointed out, changing the 
subject will break DKIM signing, but that may not matter to OP.