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,--[ On Tue, Feb 12, 2008 at 12:18:23PM +0530, Goutam Baul wrote:

[...]

| Thanks for responding. Let me try and describe my scenario in short. My
| server is at kolkata and is connected to the net using links from two ISPs.
| People all over the country are having their account in my server and they
| are connecting using either outlook or squirrelmail. The user in the example
| above is from mumbai, using a net connection from reliance and has reached
| my server. He might be connected to the net using DSL. I am not clear what
| is to be done to smarthost this mail through my ISP's mail server. I don't
| have any access to such servers. In all probability I have not properly
| understood your suggestion. Will you please explain a bit more so that I can
| try to set things correctly? Thanks again for the time you are sparing.

Smarthost[1] will let your mail server relay mails via ISPs mail server
which is authorized (probably via SPF records, Reverse DNS etc.). Most
of the mail servers won't receive a mail directly from a DSL IP, due to
unavailability of a proper PTR record (for reverse DNS lookup) or SPF
records. So you need to setup smarthosting at sender's end, check out
"relayhost" option in postconf(5)[2], which will let your mail server
relay all non-local mails via "relayhost".

References:
[1] - http://en.wikipedia.org/wiki/Smarthost
[2] - http://www.postfix.org/postconf.5.html#relayhost

HTH
- -- 
Ashish Shukla आशीष शुक्ल                      http://wahjava.wordpress.com/
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freed.in | freedom in technology and software | 22-24 February 2008 | Delhi
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