[GLLUG] Postgrey holding list

John Edwards john at cornerstonelinux.co.uk
Tue Mar 3 14:48:51 UTC 2020


On Tue, Mar 03, 2020 at 02:31:20PM +0000, Henrik Morsing via GLLUG wrote:
> On Tue, Mar 03, 2020 at 02:28:55PM +0000, Marco van Beek wrote:
>> When it connects again it just does the maths and if it is more than 300 seconds it lets it through.
> Since what? If it's stateless, what will it compare the 300 seconds to?

Database files in /var/lib/postgrey/ (at least on Debian/Ubuntu).

> It's just impossible, but nevermind, I will figure it out.

I think the main problem will probably be that postgrey does not
record anything unique such as the email's message ID, but only the
sender, recipient, and IP address of the sending mail server.

So you could see an email from Alice to Bob that has been greylisted,
and then maybe 30 minutes later an email from Alice to Bob that passes.
But you can't be sure that is the same email, or just a second one that
has been sent later.

I don't think that it is impossible, just that the data gathered may
not be reliable.

|    John Edwards   Email: john at cornerstonelinux.co.uk    |

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