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lappladmin
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smtp misconfiguration?

Hello,

I just setup an exchange 2007 test mail server, I came across this website to run a smtp test on my mail server. I ran a test without providing any authentication credential which startled me. Can anyone tell me where in the configuration that i missed that will allow mail to send without authentication?

http://smtper.sweetylife.com/
Email ServersEmail ProtocolsNetworkingExchange

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lappladmin

8/22/2022 - Mon
Will Szymkowski

You need to check your receive connector permissions group. Make sure that Anonymous is NOT selected.

Will.
lappladmin

ASKER
If leaving this option unchecked will that impact any mail flow from the internet to me?
Will Szymkowski

No it will not it will not. Although I do not know your environment you can simply re-enable it if it does. However it should not affect anything,

Will.
Your help has saved me hundreds of hours of internet surfing.
fblack61
Will Szymkowski

Second thought, it might affect internal application servers that are sending email notifications without using authentication. However from the INTERNET it do you have a smart host? If you do then it might affect that as well.

Best option is to create a new receive connector and lock it down via IP address under the networking tab and then allow anonymous permission group. It will be locked down via IP.

Do not do this on your DEFAULT receive  connector.

Will.
lappladmin

ASKER
1. I don't have a smart host.
2. that was my default receive connector.
Will Szymkowski

Well just remove the setting and see if anything happens. Preferably after hours.

Will.
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lappladmin

ASKER
Will

I ran a test last night with that option unchecked, all mails flow from the internet rejected.
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Will Szymkowski

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lappladmin

ASKER
Thanks for the help!