Apologies for not being more clear, because I see the responses going in tangents I hadn't expected. Most anti-spam products drop the connection or issue some kind of rejection message during the SMTP exchange. If the connection is dropped, the subscriber's MTA/MUA will likely try and try again until it reaches expiration time. For MS Exchange I think that's two or three days. For Outlook Express, that message just sits in the Outbox. If a rejection message was issued, hopefully the sender can interpret what the MUA is saying, or the MTA sends back an undeliverable. So, for service providers who require their subscribers to smarthost messages through their server, how are they letting the subscribers know in some kind of active way? Frank -----Original Message----- From: Suresh Ramasubramanian [mailto:ops.lists@gmail.com] Sent: Saturday, September 13, 2008 8:39 PM To: Frank Bulk Cc: Matthew Moyle-Croft; nanog@nanog.org Subject: Re: ingress SMTP On Sat, Sep 13, 2008 at 11:38 PM, Frank Bulk <frnkblk@iname.com> wrote:
How do you alert mail server operators who are smarthosting their e-mail through you that their outbound messages contain spam?
Frank
If those are actual mailservers smarthosting and getting MX from you then you doubtless have quite a lot of reporting already set up. Have you seen what Messagelabs, MXLogic etc do? There's also feedback loops, ARF formatted, where users on those mailservers can report inbound spam to the filtering vendor. .. or was that a rhetorical question and am I missing something here? -- Suresh Ramasubramanian (ops.lists@gmail.com)