From: Boris Ratner (bratner_at_nonexisting.hamakor.org.il)
Date: Fri 25 Jun 2004 - 16:46:00 IDT
Hi!
Some mail servers on the net have something "callback authentication"
procedure installed.
It goes like that:
1. you type in : "mail from: foo_at_bar.com"
2. the server digs for the MX of bar.com . if MX is not found rejects
the incoming mail.
3. if MX found the server contacts the MX on SMTP with :
"mail from: <>"
"rcpt to: <foo_at_bar.com>"
4. if any error accurs during this(3) the incoming mail (1) rejected.
connection to MX closed.
5. if the user in (3) is OKed by the MX - incoming mail (1) approved.
and connection to MX closed.
This system is based on standards but usually have 2 problems:
1. 'bar.com' doesn't have an MX -> IMHO if you have a DNS domain to
recieve mail you should have an MX.
2. MX of 'bar.com' - refuses "mail from: <>" (3, above) with errors
such as "5xx bogus mail from". This beheiviour is
WRONG and makes additional problems to the users of the domain.
So , I think you should get yourself an MX.
regards,
Boris.
=================================================================
To unsubscribe, send mail to linux-il-request_at_linux.org.il with
the word "unsubscribe" in the message body, e.g., run the command
echo unsubscribe | mail linux-il-request_at_linux.org.il
This archive was generated by hypermail 2.1.7 : Fri 25 Jun 2004 - 17:03:09 IDT