5 Jan
2017
5 Jan
'17
9:49 a.m.
Hi Per
Is there any point in greylisting genuine mailservers? We only greylist dodgy-looking setups.
True, no point in greylisting a propper SMTP engine that does queueing and would resend the email later in case of a 4XX error.
But how do you find out which ip's to greylist and which not to?
We use milter-greylist and this has nice features like being able to do DNS whitelist lookups and query SPF records to decide whether to greylist a specific trippled or not. And it can sync it's database across multiple servers.
-Benoît Panizzon-
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