How to allow only specified SMTP servers to receive mail from Exchange 2007

Send connectors, u can specify for which domain, which SMTP server to use. all the best

hello, actually is the other way round, I want to block particular smtp servers from sending mail to my exchange.

To block IP addresses of servers from connecting is part of the antispam agents. If you don't have an Edge server then you will need to install the antispam agents using the script in the Scripts directory of the Exchange installation. After installing the agents, restart the Transport Service. The IP block list configuration will then have to be enabled in both Org Config and Server Config. However it is not designed as an antispam tool. Trying to block sources of spam that way yourself is a waste of time - you will never keep up with it. Simon.Simon Butler, Exchange MVP. http://blog.sembee.co.uk , http://exbpa.com/

It all depend of the solution u are using in your organization to accept the incoming mail from other organizations, better then blocking an IP address is to block the domain name thats sending spam (which is again in a way blocking of the ip addess), and again this is supposed to be done on your internet facing smpt server.

in server configuration and hub transport I have receive mail from remote servers that have these ip addresses. If I specify there it means that all unspecified ip addresses will be rejected ?

Sorry but i didnt understand you, do u have HUB servers that are facing to the internet, or an edge server, or a diferent SMTP server. But if u are using HUB or edge follow Sembees suggestions, and technet articles that specify the antispam features that u can set and configure.

to be honest with you I am quite new to exchange and I am still gaining knowledge about how it works, in fact I would appreciate if you can explain the difference between the 3 different type of server configuration in Exchange mentioned right above or provide informative links. To my knowledge I have a hub server ( hub transport ) Thank you

It all depend of the solution u are using in your organization to accept the incoming mail from other organizations, better then blocking an IP address is to block the domain name thats sending spam (which is again in a way blocking of the ip addess), and again this is supposed to be done on your internet facing smpt server. That is a VERY poor suggestion. Blocking domains is a pointless exercise as all spam is spoofed. If blocking domains was an antispam technique that was successful then all the spammers would do is send all email as from microsoft.com so their emails got through. Blacklists do no operate on the domain level and neither do other antispam applications. The only time you block a domain is where you are constantly getting emails from the same domain where the sender doesn't have a working unsubscribe system.However for general spam blocking on domains is a waste of time. Simon.Simon Butler, Exchange MVP. http://blog.sembee.co.uk , http://exbpa.com/

to be honest with you I am quite new to exchange and I am still gaining knowledge about how it works, in fact I would appreciate if you can explain the difference between the 3 different type of server configuration in Exchange mentioned right above or provide informative links. To my knowledge I have a hub server ( hub transport ) Thank you A full explanation of how Exchange works is documented on Technet. I suggest that you go and spend some time reading what Microsoft have written - the documentation is very good. Otherwise get a consultant in to review your Exchange installation, as Exchange 2007 is a complex product. Simon.Simon Butler, Exchange MVP. http://blog.sembee.co.uk , http://exbpa.com/

It all depend of the solution u are using in your organization to accept the incoming mail from other organizations, better then blocking an IP address is to block the domain name thats sending spam (which is again in a way blocking of the ip addess), and again this is supposed to be done on your internet facing smpt server. That is a VERY poor suggestion. Blocking domains is a pointless exercise as all spam is spoofed. If blocking domains was an antispam technique that was successful then all the spammers would do is send all email as from microsoft.com so their emails got through. Blacklists do no operate on the domain level and neither do other antispam applications. The only time you block a domain is where you are constantly getting emails from the same domain where the sender doesn't have a working unsubscribe system.However for general spam blocking on domains is a waste of time. Simon. Simon Butler, Exchange MVP. http://blog.sembee.co.uk , http://exbpa.com/ Yes u are right, thanks for pointing that out Simon.

So Simon do they work on ip addresses , please inform thanks

So Simon do they work on ip addresses , please inform thanks Do what work on IP addresses? Blacklists? Yes. They are all host based, because spam is spoofed. However you will never keep up with creating your own blacklist manually because the IP addresses change rapidly. That is why people use third party blacklist providers or an appliance or application that generates the blacklist for you on the fly. Simon.Simon Butler, Exchange MVP. http://blog.sembee.co.uk , http://exbpa.com/

yes for blacklists thats what I ment ip address for. Thank yOu