Re: [exim] How multi-recipient messages are handled?

Thank you, as a exim beginner I have to chew on this and read the docs.


On 11/19/18, Ian Zimmerman via Exim-users <exim-users@???> wrote:
> On 2018-11-18 11:50, Aki Kyo wrote:
>
>> I want to run something like rspamd and apply per-user spam filtering,
>> which means multiple recipients might have different spam scoring
>> results or different white/black list results on the same message. I
>> know it depends when it's done, like during the SMTP process or after
>> accept.
>
> [...]
>
>> How does Exim handle this situation, what is the recommended approach
>> taken by Exim administrators? I appreciate links, opinions, tips.
>> Thank you.
>
> There are many "dirty" ways and a few "clean" ways.
>
> The clean ways I know of:
>
> 1. transport_filter (spec chapter 24, towards the end) on the local
> delivery transport
>
> 2. a custom transport with a pipe driver, where the pipe command is a
> script involving spamc
>
> 3. set up .forward files for users and leave it to them not to break it
> :)
>
> You should also look at the content scanning features and at the malware
> control on ACLs. While the primary use of ACLs is at SMTP reception
> time you _can_ run an arbitrary ACL from an expansion in a transport
> stanza. This is what Jeremy suggested in a recent thread I started, and
> I have done that and it works. That said I haven't found the malware
> control very convenient to use.
>