On 20/11/2008 Mark Rogers wrote:
> What I want to add is to allow it to collect mail for certain domains 
> for forwarding to another SMTP server (the server to use depends on 
> the 
> email domain and is not held in MX records). (Typically it will 
> deliver 
> mail directly into an Exchange server at a customer site without that 
> customer's ADSL static IP being published in MX records.)
> 
> I've found secondary MX information (where Postfix would look up the 
> destination based on DNS) but haven't found a good enough query to 
> find 
> information about setting a destination SMTP server per email domain.

is 
http://www.knowplace.org/pages/howtos/smtp_gateway_for_multiple_domains_with_postfix.php
any help ?.................

-----------

/etc/postfix/transport

This file defines the relationship between domains and the server(s) 
where mail is forwarded.

        example1.com              smtp:insidesmtp.example.com
        example2.com              smtp:insidesmtp.example.com
        subdomain.example.com     smtp:insidesmtp.example.com


[ presumably you can put the recipient server IP here if the recipient 
isn't in DNS - Phil ]

/etc/postfix/relay_recipients

This file folds a complete list of email address for which the email 
gateway will accept mail. Even though you have to enter the values as a 
pair (key & value), the second part (the value) doesn't actually matter 
as long as the email addresses are correct.

        [EMAIL PROTECTED] OK
        [EMAIL PROTECTED] OK
        [EMAIL PROTECTED] OK
        [EMAIL PROTECTED] OK
        [EMAIL PROTECTED] OK
        [EMAIL PROTECTED] OK
------------

I think the standard SMTP retry intervals will cope with outages, 5 days 
is the default according to 
http://www.postfix.org/postconf.5.html#maximal_queue_lifetime



Phil




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