Re: Wi-fi and SMTP
- From: John Navas <spamfilter0@xxxxxxxxxxxxxx>
- Date: Mon, 01 May 2006 22:39:24 GMT
[POSTED TO alt.internet.wireless - REPLY ON USENET PLEASE]
In <pq0d52dam5pkdeu945q8dd9oufgt2gffge@xxxxxxx> on Mon, 01 May 2006 22:59:43
+0100, "Anthony R. Gold" <not-for-mail@xxxxxxxxxx> wrote:
On Mon, 01 May 2006 20:06:44 GMT, John Navas <spamfilter0@xxxxxxxxxxxxxx>
wrote:
Which ISP? I've not heard of any ISP that blocks Authenticated SMTP ports.
Most ISPs block outward connections to SMTP servers, regardless of whether
the user agent is prepared to perform authentication. Maybe you are you
confusing authenticated SMTP with secure SMTP.
There's no practical way for an ISP to block outbound SMTP connections except
by port, as in the case of blocking port 25, which is what I was referring to.
Authenticated SMTP is usually configured for a port other than 25, as in the
case of some services using port 587, which isn't a secure port (as in the
case of port 465). There's no point in blocking port 587 (with regard to
spam), since it isn't used for message *delivery*, only for message
*submission*.
RFC 2476 "Message Submission" (Standards Track):
| 3. Message Submission
|
| 3.1. Submission Identification
|
| Port 587 is reserved for email message submission as specified in
| this document. Messages received on this port are defined to be
| submissions. The protocol used is ESMTP [SMTP-MTA, ESMTP], with
| additional restrictions as specified here.
See also:
| 3.3. Authorized Submission
--
Best regards, SEE THE FAQ FOR ALT.INTERNET.WIRELESS AT
John Navas <http://en.wikibooks.org/wiki/FAQ_for_alt.internet.wireless>
.
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