nanog mailing list archives
question on ptr rr
From: garrett.allen () comcast net
Date: Sat, 07 Feb 2004 11:25:39 +0000
this may be deemed off topic - if so apologies in advance. however i respect many of the opinions i see here so thought i would take a chance and ask. we are a stub network, injesting about 30k emails daily. about a year ago we implemented a spam filtering product. it works well. recently we turned on the knob to enable it to do reverse lookups. only the mild version, a reverse is made on the ptr rr for the ip address sending the email. if it fails the spam filter issues a 421 and closes the connection. unfortunately, we have 6 sites thus far that are legitimately trying to communicate with us but don't have ptr's associated with the ip address sending emails. since it obviously isn't a requirement to have one is it generally accepted to do so? any sense for how many end networks do and don't? thanks in advance.
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- question on ptr rr garrett . allen (Feb 07)
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- Re: question on ptr rr Suresh Ramasubramanian (Feb 07)
- Re: question on ptr rr Randy Bush (Feb 08)
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- Re: question on ptr rr Suresh Ramasubramanian (Feb 10)
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- Re: question on ptr rr Suresh Ramasubramanian (Feb 10)
- Re: question on ptr rr Suresh Ramasubramanian (Feb 07)
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- Re: question on ptr rr Suresh Ramasubramanian (Feb 10)