26 Oct
2021
26 Oct
'21
12:23 a.m.
On Mon, 25 Oct 2021, Ron Garret wrote:
Note that message-ids are not guaranteed to be unique. During my test I found groups of as many as 20 different messages with the same message ID. (Turns out this makes quite a reliable spam signal!)
It's by far not a rare situation: duplicate message-ids happen whenever the sender names more than one local recipient during SMTP. It's a wholly unreliable way to indicates spaminess. However, if a high proportion of those recipients do not exist, ...
Joseph Tam <jtam.home@gmail.com>