On 23/08/2024 09:53, Cyborg via Exim-users wrote:
>> To store relaying mail to a disk one can use Exim with redirect router,
>> which have "unseen" option and feed message copy to "appendfile" transport.
>> This is purely Exim solution, without any external software.
>
> That is not the best way to do it, as each mail needs a sha256 checksum generated, so the archiver can testify, that the archived email is untampered.
> With a mbox file, you would need to sign this growing pile of data each time a message is appended, which will overpower your server in a few weeks.
>
> Storing the messages in the default maildir format, allows to sign each message separately without causing hassle to the system.
The appendfile transport can store in maildir format, and you could use a
transport-filter to generate your checksum.
--
Cheers,
Jeremy
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