I'm sure I'm not the only one who's tried to do this, but I've checked the forums and Google and couldn't find any instructions or documentation on this one: is there any way to tell Zimbra to block email from any IP address that doesn't resolve via a reverse DNS lookup?
I'm running ZCS Version 6.0.14_GA_2928.NETWORK on Ubuntu 8.04.
Block IPs that Don't Resolve via Reverse DNS Lookup
Block IPs that Don't Resolve via Reverse DNS Lookup
I think there is a check button to do that in the MTA tab in Global Settings?
Block IPs that Don't Resolve via Reverse DNS Lookup
[quote user="gvillaran"]I think there is a check button to do that in the MTA tab in Global Settings?[/QUOTE]
I found a "DNS Settings" section. I'm assuming the setting you're thinking of is the check box for "Sender's domain (reject_unknown_sender_domain)"?
I found a "DNS Settings" section. I'm assuming the setting you're thinking of is the check box for "Sender's domain (reject_unknown_sender_domain)"?
Block IPs that Don't Resolve via Reverse DNS Lookup
yes, thats the option i was thinking about.
is that what you want?
is that what you want?
Block IPs that Don't Resolve via Reverse DNS Lookup
That's probably what I want, but I'm not entirely familiar with how the "reject_unknown_sender_domain" command works, so I want to make sure this will fulfill my original request before I implement it.
Block IPs that Don't Resolve via Reverse DNS Lookup
Well if i send an email from isme@mydomaindontexist.com it will be rejected if the domain "mydomaindontexist.com" doesnt exist.
simple.
simple.
Block IPs that Don't Resolve via Reverse DNS Lookup
But, is that the same thing as an IP address not resolving to a domain via reverse DNS lookup? It sounds like it is, but I want to make sure.
Block IPs that Don't Resolve via Reverse DNS Lookup
Also, can anyone give me the likelihood of legitimate email being blocked with this reverse DNS lookup feature enabled?
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Block IPs that Don't Resolve via Reverse DNS Lookup
bad mail server setup
Block IPs that Don't Resolve via Reverse DNS Lookup
[quote user="Yves Pires"]bad mail server setup[/QUOTE]
What do you mean by this?
What do you mean by this?
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