Hi!
Some mail servers on the net have something "callback authentication"
procedure installed.
It goes like that:
1. you type in : "mail from: [EMAIL PROTECTED]"
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: <[EMAIL PROTECTED]>"
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.
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