On Jan 3, 2012, at 8:11 AM, Michael Maymann wrote:

> Hi List,
> 
> I have a internal mailrelay, that I would like to provide following service:
> 1. mail to our own domain is send directly to our externally hosted 
> (outsourced) mailserver
> 2. mail to external domains are relayed through ISP-mail-relay only for 
> specific domains
> 
> I have the following in my main.cf now (not enabled yet):
> #<our_own_domain.com> smtp:<our_external_hosted_mailserver>
> #<servicepartner1> relay:<our_isp_mailrelay>
> #<servicepartner2> relay:<our_isp_mailrelay>
> #<servicepartner3> relay:<our_isp_mailrelay>
> #<servicepartner4> relay:<our_isp_mailrelay>
> #<servicepartner5> relay:<our_isp_mailrelay>
> 
> My server is used primarily (99,96% are going to our_own_domain) by internal 
> services to send notifications to our users, but also some mails are needed 
> to a handfull external servicepartners...
> Soon we will also send critical alert from our monitoring solution, and I 
> would therefore like to get the most secure solution without implementing a 
> filter, that might blacklist vital alerts
> I will get my server whitelisted also in our_external_hosted_mailserver to 
> accept all mails (no filtering) to make sure all mails are comming in and not 
> stopped by a spamfilter there...
> It would then only be possible to send spam to our servicepartners this way - 
> which I guess should be highly unlikely to happen...?
> 
> 1. Is this the right way to do it - or are there better alternatives ?
> 2. When should I use smtp/relay in my config - does the above seem to be 
> correct ?
> 
> 
> Thanks in advance :-)
> ~maymann


greetings

Check out transport maps
http://www.postfix.org/postconf.5.html#transport_maps

-j

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