Re: Blacklisted - ReadList.com

10 msg	postfix relaying
2 msg	Restrict sending external mail depending on LDA...
2 msg	monitoring emails for a particular user
1 msg	loops back to myself with antivirus gateway...
2 msg	cyrus and postfix issue...
2 msg	Deny messages to local mailing lists
2 msg	Translation delivery error messages
3 msg	Why smtp instead of relay?
2 msg	Chroot Timestamps
18 msg	relay access denied
7 msg	Question about Successful Mail Delivery Report
6 msg	clamav question
2 msg	Find/Replace Text, Strip Graphics

Blacklisted
\ Rocco Scappatura (16 May 2007)
. \ Ralf Hildebrandt (16 May 2007)
. \ Rene van Hoek (16 May 2007)
. \ Rocco Scappatura (16 May 2007)
. . \ Ralf Hildebrandt (16 May 2007)
. \ Rocco Scappatura (16 May 2007)
. . \ Rene van Hoek (16 May 2007)

3 msg	Charset problems
4 msg	[urgent] how to use remote mail server ?
1 msg	[Re: sasl problem]
2 msg	off-topic?
7 msg	smtpd_milter question
1 msg	Off-topic: Linux distro compare site

Subject:	Re: Blacklisted
Group:	Postfix-users
From:	Rene van Hoek
Date:	16 May 2007

Rocco Scappatura wrote:

>>
>> Because Exchange cannot handle mail for nonexistent
>> recipients in a sound manner, we deny our clients to relay
>> message through our MTA with Exchange (except if they have
>> closed port 25 in their firewall, or if they have some add-on
>> for Exchange running which fixs the nonexistent recipients issue).
>
> I belive you blindly.. but I can deny to the Exchange server to relay
> messages trhough my relay server..
>
> Is there any solution? Is there anything that I can suggest to the
> administrator of the guilty mail server (other than to hrow Exchange
> away! ;-) )
>
> BR,
>
> rocsca
>

Please see: KB886208 'Exchange queues fill with many non-delivery
reports from the postmaster account in Small Business Server 2003'

http://support.microsoft.com/kb/886208

This will stop backscatter generation on Exchange, but will only work on
Exchange 2003 or higher (From the KB Article: ' Recipient filtering is
only available in Exchange 2003 Server. ')

If they use Exchange 2000 or lower, they should buy an add-on. Or place
an MTA before their Exchange Server which is capable of rejecting mail
to non-existent recipients (for example Postfix).

Please see: http://www.unixwiz.net/techtips/postfix-exchange-users.html

--
Met vriendelijke groet,

Rene van Hoek