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SMTP Security

Posted on 2005-04-12
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Last Modified: 2010-04-18
I have just set up a simple 2003 server to host a couple of key web sites. It is not a name server.

My concern is the security surrounding port 25

I have set up the virtual smtp server and I hope i have put the right security in place to stop people using it for spam.

Could someone confirm if my settings are sufficient to do this?

Delivery/Outbound security = anonymous access
Access/Authentication = anonymous access
Access/Conection control  = left blank (do I need to set this the same as the relay option?)
Relay = Only the list below to have access and the IP of my web server.

That's about it. I'm dead nervous about leaving port 25 open. Will it be safe with the above settings?

Many thanks


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Question by:Laride
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JamesDS earned 1000 total points
ID: 13765258
Laride
By default the MS SMTP Server is secured against relay. The service itself is secure, provided you keep the server patched and don't allow other traffic to the server. There are a number of public open relay check sites, this is my favourite: http://www.ordb.org/submit/

Your settings look fine to me.

Cheers

JamesDS
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by:JamesDS
ID: 13765265
Laride
Also, FIREWALL your server (of course!)

Cheers

JamesDS
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by:Laride
ID: 13765665
On the subject of a firewall; would it be OK to use the 2003 server soft firewall which comes with the latest service pack?

It seems that the cost of a PIX or equivalent is a little over the top.

What would be the REAL benefit of a hardware firewall?
0
Nothing ever in the clear!

This technical paper will help you implement VMware’s VM encryption as well as implement Veeam encryption which together will achieve the nothing ever in the clear goal. If a bad guy steals VMs, backups or traffic they get nothing.

 
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by:JamesDS
ID: 13765797
Laride
Yes, you can use the builtin firewall, but be careful how you configure it to make sure you're not missing anything.

Hardware firewalls are usually faster and typically "more" secure and feature rich as they are dedicated boxes. Software firewalls are cheaper and often have less features and are dependant for their security on the OS they reside on.

Software firewalls are fine for most applications - I use one here.

Cheers

JamesDS
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by:Laride
ID: 13766114
Thanks James, sound advice.
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by:JamesDS
ID: 13769676
Laride
Welcome, glad to help

Cheers

JamesDS
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