From: Steve (steve.hilldigitalcertainty.co.uk)
Date: Thu Jun 18 2009 - 01:55:28 CDT

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On Thu, 2009-06-18 at 12:21 +0530, J. Bakshi wrote:
> Dear list,
>
> Here is a very urgent problem with **relay** in my postfix.
>
> My postfix is allowed to relay a particular domain. I have put the
> configuration as
>
> ````````````````````````````````
> relay_domains = < domian_name allowed to relay>
> `````````````````````````````````````
>
> I maintain a text file /etc/postfix/virtual as a source of all my user
> aliases.
> I have done " postmap /etc/postfix/virtual" to generate the hash file.
> Here is my config in main.cf
>
> ```````````````
> virtual_alias_maps = hash:/etc/postfix/virtual
> ```````````````````````````
>
> To activate the map I have restarted the postfix as usual.
>
> If I check the mapping with " postmap -q <username><domain_name>
> hash:/etc/postfix/virtual " it reports back its aliases.
> Even from server If I send mail to a aliases it forwarded to its actual
> destination perfectly.
>
> But If I send mail from another mail server to any of these aliases it
> is not forwarded. Should I always send mail from my own server to get
> the aliases working correctly ? then waht is the use of relay domain.
> I am really very very confused. Please enlighten me.
>
> thanks
Just as an aside before you do something really bad here - what would be
to stop me telnet'ing in on port 25 to your Postfix and trying to send
mail to bill.gatesis.invalid pretending to be one of your user aliases?

What kind of authentication are you going to use so that you know I am
who I say I am?

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