[LINK] RFI: Spam-registration of IP-addresses

[David Lochrin]

On 2020-11-21 07:14, Roger Clarke wrote:

> As I understand it, the purpose of spam-registers is so that ISPs receiving email can check the IP-address **of the SMTP-server** from which a message is despatched.  If some threshold volume of messages from that address is detected as spam, [...].

That's my understanding too, for what it's worth.

But is it possible the institutions hosting the recipient's email servers have centrally-managed clients with filters which move some messages to the 'junk' folder without touching the headers?  Of course such messages should also be flagged as unread so the recipient knows they're there, but that invites users to treat the junk folder as another inbox.  Alternatively, messages may be tagged as junk in the transfer protocol, especially if IMAP is used.

David Lochrin