Matus UHLAR - fantomas writes:
Am 2010-11-09 15:22:58, hacktest Du folgendes herunter: > Since there's fallback to "A" record defined in RFC, there is no way to > indicate that an existing host is accepting mail. Mail from A host is > accepted, and mail for such host is sitting in the queue until it times out.On 10.11.10 16:27, Michelle Konzack wrote:Not right, because courier-mta tell the sender that it does not accept mail.It will not. Courier-mta _can_ not know that some _remote_ host having A address does not do mail. Even temporary failure connecting to the A can mean the host does send and accept mail but is unreachable now. And even this would require SAV which is often considered abuse.> That is why some admins want to have way to indicate this kind of mail > should not be generated not accepted. Maybe they should read the courier documentation?Oh yes? So, since now, every mail admin in the world is supposed to read courier documentation, even when using postfix or e.g. microsoft exchange?> Have you never seen mail destined to a host with A record that does > not accept mail? Yes, my VServers. Why should a VServer which host only Websites (in my case arround 800 sites per VServer) accept messages?...Oh, before I switched to courier-mta on the VServers I used ssmtp which mean, the MTA does never respond to a SMTP request.Isn't this exacly the same I'm telling already?The websites have MX records which point to <mail.tamay-dogan.net> and the VServers runing courier use the MTA only to send status messages or for Web-Forms.So, you do accept mail for all of your websites? Well, I am not. We are running bunch of virtualhosts at home.nextra.sk, and home.nextra.sk has 2 addresses, neither of them runs SMTP. Actually, nobody should send mail from or to @home.nextra.sk addresses, but since it has A records, all mail servers in the world will probably accept @home.nextra.sk in mail from: or rcpt to: (at least from local) and apparently even deliver the former without any change to know that those addresses do not exist. This is what I want to avoid. And please do not tell me I should point MX somewhere just to get flooded by spam and backscatter (SAV etc). We just do NOT currently have any indication to indicate that some domain names in mail should not be accepted. SPF isn't widely used and even where it is, it's not always configured for mail from: rejection.
Actually there is, if I understood you correctly. domain.com MX 0 localhost.domain.com localhost.domain.com IN A 127.0.0.1This will cause any mail addressed to domain.com to immediately bounce, pretty much by any mail server.
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