Blocking email from all but a few specified servers

Hi,
I'm using OS X Server 10.6 with the email server. My users must be able to receive mail from hotmail, yahoo, and gmail, but in order for the mail server to accept emails from those domains, I have to turn the minimum junk mail score all the way up to around 35, which means that they also receive lots of junk email.
Is there a way that I can tell my email server to only accept mail from gmail.com, hotmail.com, yahoo.com, and of course our local domain? I know you can do this in MS Exchange.

No, there isn't a way.... There are many ways.
the real documentation is at http://www.postfix.org
If you know the IP address ranges that you want to allow, you can list them in a "whitelist" by network and add this in your smtpdrecipientrestrictions item. (those are really "client" restrictions, but adding them in the recipient ones makes for more obvious order of checking).
checkclientaccess cidr:/etc/postfix/goodclients
where goodclients has a cidr format such as:
218.66.0.0/15 REJECT
220.192.0.0/10 OK
Once you have edited the file, you created the "compiled" version with:
postmap cidr:/etc/postfix/goodclients
Another way to do this is whitelist based on the email the sender is pretending to use. For this, you use:
checksenderaccess hash:/etc/postfix/whitelist also in the smtpd_recipient)restrictions.
This file has format such as:
@hotmail.com OK
@yahoo.com OK
once you have built the text file, you also use postmap:
postmap hash:/etc/postfix/whitelist
(this creates a whitelist.db file)
For your own internal people, there is a permit_mynetworks line in the smtpd_recipient)restrictions which gives open permissions to people using clients in your corporate internal network.
http://www.postfix.org/postconf.5.html#smtpdrecipientrestrictions gives you a good feel for the types of checks you can include. (at the end of that section, there are links to the checks you can include in the recipient line but which apply to the :
smtpdclientrestrictions, (IP address)
smtpdhelorestrictions (name used in the HELO command)
smtpdsenderrestrictions (name used in the MAIL FROM: command)

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Printing to [email protected] works fine from @gmail.com and @hotmail.com addresses but Spamcop blocks email from @tiscali.co.uk addresses (TalkTalk webmail)
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Perhaps I just missed this in the documentation, but is there a way to hide
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PatM wrote:
> Thanks to all for your comments and confirmation--I think this is worthy of
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> "Dave Parkes" <[email protected]> wrote in message
> news:[email protected]..
>> If there is, I don't know of it. Removing all the rights is as far as you
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>>
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>>
>> Cheers Dave
>>
>>
>> --
>> Dave Parkes [NSCS]
>> Occasionally resident at http://support-forums.novell.com/
>
>
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PMC Consulting

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Blocking email from all but a few specified servers

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