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Email - SPAM rejection Exchange McAfee

We are recieveing excessive spam and rejections from windows live and hotmail accounts.

The setup is as follows;

SBS 2003 Exchange smtp feed
Fixed ip address, McAfee ITotal Protection Service.

McAfee is catching a fair amount of spam for users, but they are still recieving too much.
Also users are having mail sent to hotmail windows live accounts rejected, with the following message.

host mx3.hotmail.com [65.54.244.200]: 550 SC-001 Mail rejected by Windows Live Hotmail for policy reasons. Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation problems. If you are not an email/network admin please contact your E-mail/Internet Service Provider for help. Email/network admins, please visit http://postmaster.live.com for email delivery information and support

When i do a rDNS lookup we have no-dns-yet.demon.co.uk ???  this is not our domain.

Any help apprecieted


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Suraj
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check if the server is open for relay. properties of Default smtp virtual server ->access tab--> relay
you should have the first option selected there. "Only the List Below"
and there should be nothng there in the List
lemme know if you have any questions

-x
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thanks for responses, i would prefer not to use the blacklist, although it may come to that, I will tune the exchanhe filters first.

Regards, reverse DNS we already use the demon smart host to send.??

If you are sending email through the Demon smart host (not something I would advise personally, but that can wait for another day), then you shouldn't be getting those messages, unless Hotmail have blocked Demon's SMTP server cluster.

It could always be the content of your messages. Do you have graphics in your messages linked to external hosts, use stationery?

A blacklist isn't going to help with outbound email anyway.

-M
mestha

Thanks just got something back from demon saying that hotmail had blocked one of their gateways. and it has now been resolved.

Thanks

I am at the moment changing the values in Global Setting - Intelligent Message Delivery , i am reducing them to see if it improves things.

Although is suggests that you need ienable intelligemt message filtering in the vitrtual SMTP connector, i do not seem to have the option to enable. I am not sure if that is just for the gateway or for the junkmail filter.

am i wasting my time changing the thresholds?
I spotted how to add intelligent messaghe filtering to the Virtual SMTP connection ( edit apply ),
I have never used that before is it useful, do people keep it on?

Yes Ofcourse it is. it is one of the best Anti spam filter in Exch 2003 !!!
its scans the entire body , subhect of the email and rates the email an SCL rating.(1-9)
it will do this for Inbond internet mail...
it fires 2 times... One at Gateway and other at store...
Download the Guide :
http://technet.microsoft.com/en-us/library/aa996624(EXCHG.65).aspx
this will tell you each and every thing about it....

Just read this too... your all questions will be answered ;-)

http://support.microsoft.com/kb/555602

-x
Sorry to ask, is it good> or is your reply got some sarcasm in it, thanks for the links either way.
Its Good ! best practice !
its an inbuilt feature of spam filter By microsoft... so .. its good....
IMF does filterins based on words, characters .. which no other filter does.. you can also customise it...
so Thats why.. its called INTELLIGENT MESSAGE FILTER ;-)

-X
IMF is basic at best. It is good for free, but that is about it.
However as with all antispam solutions, it can work really well for some people and be totally useless for others. I have some clients who use nothing else, others where we had to go to a third party for antispam that worked.
However I do suggest that you try it, as it is built in to the product. However if it doesn't work for you then you will need to look elsewhere.

If you have licences for McAfee's antispam solution then I would be looking to see if that is running at optimum levels, however it can be the case that a product simply doesn't work for some people.

-M
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thanks for the info