Actually, you have to ask your provider for that. Tell them you'd like a pointer (PTR) record created for your mail server's fully-qualified domain name (mail.domain.tld, for instance). Jim Harrison MCP(NT4, W2K), A+, Network+, PCG http://www.microsoft.com/isaserver http://isaserver.org/Jim_Harrison http://isatools.org Read the help, books and articles! ----- Original Message ----- From: <nperez@xxxxxxxxxxxxxxx> To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx> Sent: Wednesday, December 03, 2003 12:47 Subject: [isalist] Reverse DNS entry http://www.ISAserver.org I get an error when I try to send emails to certain domains. The error reads, "Your IP (xxx.xxx.xxx.xx) does not have a reverse DNS entry. Please contact YOUR system administrator or YOUR internet provider. Disconnecting..." Why would some email servers reject if I don't have reverse DNS entry? How do I create a reverse DNS entry? Is it safe? Thanks! ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 Exchange Server Resource Site: http://www.msexchange.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: jim@xxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')