13 messages in org.freebsd.freebsd-mobileRe: Sending mail to FreeBSD.org (was:...| From | Sent On | Attachments |
|---|---|---|
| wal...@digger.net | Nov 9, 2001 3:39 am | |
| Torfinn Ingolfsen | Nov 9, 2001 4:41 am | |
| Eric Masson | Nov 9, 2001 5:25 am | |
| Chad R. Larson | Nov 9, 2001 6:18 am | |
| Kevin Oberman | Nov 9, 2001 9:32 am | |
| wal...@digger.net | Nov 10, 2001 12:59 am | |
| wal...@digger.net | Nov 10, 2001 1:10 am | |
| Kevin Oberman | Nov 10, 2001 9:18 am | |
| Greg Lehey | Nov 13, 2001 2:38 am | |
| wal...@digger.net | Nov 13, 2001 10:09 pm | |
| Louis A. Mamakos | Nov 14, 2001 6:32 am | |
| Jim Durham | Nov 14, 2001 7:36 pm | |
| Chris Shenton | Nov 19, 2001 9:38 am |
| Subject: | Re: Sending mail to FreeBSD.org (was: FreeBSD lockup accessing serial port on Thinkpad) | |
|---|---|---|
| From: | Jim Durham (dur...@w2xo.pgh.pa.us) | |
| Date: | Nov 14, 2001 7:36:41 pm | |
| List: | org.freebsd.freebsd-mobile | |
On Wednesday 14 November 2001 09:33 am, Louis A. Mamakos wrote:
I send to mail.pacbell.net (aka mta7.pltn13.pbi.net, mta5.snfc21.pbi.net, mta6.snfc21.pbi.net). From the look of the bounce messages, they are leaving off the hostname and sending just the domain (pltn13.pbi.net or snfc21.pbi.net). Which is good and proper:
RFC 821: "HELO <SP> <domain> <CRLF>" (Though it goes on to contradict itself with "The argument field contains the host name of the sender-SMTP", ALL examples given use a domain name.)
RFC 1123: "The sender-SMTP MUST ensure that the <domain> parameter in a HELO command is a valid principal host domain name for the client host. [...] The HELO receiver MAY verify that the HELO parameter really corresponds to the IP address of the sender. However, the receiver MUST NOT refuse to accept a message, even if the sender's HELO command fails verification."
RFC 2821: "The argument field contains the fully-qualified domain name of the SMTP client if one is available."
...and others.
No, you mis-interpret the specification. <domain> refers to a domain name, e.g., the fully qualified domain name of the host. It's not what might othewise be called the "sub-domain". Unless pltn13.pbi.net resolves to something useful (which apparently it does not), this isn't going to be accepted. The HELO command is supposed to identify the actual end-system host submitting the message to produce accurate adivisory information and proper Received: header lines. It's not intended to be some generic domain identifier.
However, 1123 *does* say that "the receiver must not refuse to accept a message", etc, etc. I noticed that hub.freebsd.org is postfix. Sendmail would accept the message, but probably append a header saying "Possibly Forged" or something of that sort. It sounds like that is the intent of the RFC.
-Jim
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