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Important: Correct Hostnames
Authored by: jasenko on Mar 18, '04 10:01:16PM

The most important thing is to use valid hostnames in main.cf, in most cases, mailservers on the other side will reject your messages if it can't reach the hostname. Here is how it works:
You added

myhostname = notvalidhost.com

When you send a message myhostname is added to your username and it looks like this

username@notvalidhost.com

Receiving server checks notvalidhostname.com and returns a message that notvalidhostname.com is unroutable.

I think any valid hostname will work. I use my own, set up at dyndns.org and postfix works without a problem for sending emails via Internet. Using this method can affect local mail delivery though.



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