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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, 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 =

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

Receiving server checks and returns a message that is unroutable.

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

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