From: Alfredo Rezinovsky (alfredo_at_nonexisting.hamakor.org.il)
Date: Fri 25 Jun 2004 - 20:02:31 IDT
El vie, 25-06-2004 a las 15:46, Boris Ratner escribió:
> 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.
>
Any REAL mail address has an MX resolvable domain, just use a REAL FROM:
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This archive was generated by hypermail 2.1.7 : Sat 26 Jun 2004 - 01:21:42 IDT