Scott, does IMail do it's ip4r checking after the whole message is received and the connection terminated or does check on the HELO/EHLO and send an error code back to the remote server?
If it does that latter, the remote timeout settings may be a concern. I have been tracking the tarpitting features of our gateway and found that a lot of servers time out at 30 seconds, and more at 60. If it is a spammer then no big deal, but if it is a legitimate mail server, and you are performing a lot of ip4r tests, some messages may be delayed a long time until redelivery is attempted, or maybe never received at all. I have seen some tests take as long as 10 seconds, but these instances were generally due to very heavy traffic on our end, or some other transient network condition. If IMail is checking on HELO, then using Declude for these tests would eliminate this risk. Brian On 05/27/03 7:13pm you wrote... >However, the main disadvantage here is that it will slow down delivery of >the E-mail by having IMail process it. If you have 60 ip4r tests running >in IMail, and they take an average of 1 second each to get the DNS results >back, that's a full minute that the E-mail delivery will be delayed for >valid E-mail (assuming that your local DNS server doesn't have a cached >answer). Also, if IMail's SMTPD process has a limit to the number of >E-mails it can handle at the same time, this limit would get hit much more >quickly with lots of ip4r tests running (I don't know if there is a limit, >however). > > -Scott >--- >Declude JunkMail: The advanced anti-spam solution for IMail mailservers. >Declude Virus: Catches known viruses and is the leader in mailserver >vulnerability detection. > >--- >[This E-mail was scanned for viruses by Declude Virus >(http://www.declude.com)] > >--- >This E-mail came from the Declude.JunkMail mailing list. To >unsubscribe, just send an E-mail to [EMAIL PROTECTED], and >type "unsubscribe Declude.JunkMail". The archives can be found >at http://www.mail-archive.com. > --- [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] --- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to [EMAIL PROTECTED], and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com.
