Re: Postfix Maia and Exchange

>Hi,
>
>   Not sure how you are trying to set up your Maia, but
I do the frontend
>to Exchange witout setting up any users at all... Just
use the default
>user () and have postfix probe the exchange server to see
if the account
>exists... Here is a sample main.cf file off an
in-service Maia filter:
>

>mydestination = foo.com, bar.com, other.com

>local_transport = error:no local mail delivery
>local_recipient_maps =

>relay_recipient_maps =
hash:/etc/postfix/relay_recipients

>relay_domains = mrains.com, 192.168.1., 192.168.2,
192.168.5

>smtpd_recipient_restrictions =
      permit_sasl_authenticated,
      permit_mynetworks, reject_unauth_destination,
      reject_unauth_pipelining,
      reject_unknown_recipient_domain,
      reject_unverified_recipient

>unverified_recipient_reject_code = 550
>address_verify_map = btree:/var/spool/postfix/verify
>
>The transport map simply says:
>
>foo.com              smtp:[192.168.1.250]
>bar.com              smtp:[192.168.1.250]
>other.com            smtp:[192.168.1.250]
>
>
>HTH,
>
>Dave

Not all versions of Exchange will immediately reject mail to
invalid users 
(and some of the ones that do need to be configured to do
so) so 
reject_unverified_recipient may work great for you but it
may not work for 
others. Older versions of Exchange will accept the mail,
then bounce it, so 
reject_unverified_recipient will not work in those cases. I
agree that it is 
the fastest way to solve the problem if the conditions are
right.

I have never seen IP addresses listed as domains in
relay_domains and I'm 
not sure what you have going on there. You have placed
domains you relay for 
in mydestination. mydestination is for local delivery. A
properly set up 
system that is acting only as a relay may be more like:
mydestination =
and your foo.com bar.com and other.com should be in
relay_domains. BUT, 
since I don't know what you have in your relay_recipients
map at the moment, 
making this change could start rejecting all mail to those
three domains. 
Here's why: if you have domains listed in relay_domains and
you have a 
relay_recipients map, then for each domain in relay_domains
you must ideally 
list every single email address you accept mail for.
Assuming you have more 
than one domain and you have configured
relay_recipient_maps: if you don't 
have addresses for every user in one of those domains then
at least you must 
have a wildcard (other.com OK) or all mail for that domain
will be 
rejected. With a wildcard all mail for that domain will be
allowed.

Gary V

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