What do you mean by support SPF? There are 2 sides to SPF: Publishing and querying. As Danny said, to Publish your SPF record requires a valid REVDNS for your e-mail server public IP and a TXT record in your DNS zone. Querying is a whole other ball of wax. John Tolmachoff Engineer/Consultant/Owner eServices For You > -----Original Message----- > From: Danny [mailto:nocmonkey@xxxxxxxxx] > Sent: Tuesday, February 08, 2005 6:37 PM > To: [ExchangeList] > Subject: [exchangelist] Re: SPF > > http://www.MSExchange.org/ > > On Wed, 9 Feb 2005 12:05:14 +1100, adrian@xxxxxxxxxxxxx > <adrian@xxxxxxxxxxxxx> wrote: > > http://www.MSExchange.org/ > > > > > > > > What do I need my ISP (who maintains our external DNS ) to do for us to > > support SPF?? We have several domains and MX's all pointing back to the one > > box. Is only one reverse DNS entry required? Will this support all our > > domains? Sorry for the ignorance but this is one area I am quite new to. > > We run split-brain DNS (I assume that internal DNS is of no consequence in > > relation to SPF. > > Your ISP would add a TXT record in the DNS for your domain, which, in > SPF format, would specify the host or IP address of all the externally > (Internet) accessible servers that you would send email from. Check > out the SPF wizard here: http://spf.pobox.com/ > > ...D > > ------------------------------------------------------ > List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist > Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp > Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ > ------------------------------------------------------ > Other Internet Software Marketing Sites: > World of Windows Networking: http://www.windowsnetworking.com > Leading Network Software Directory: http://www.serverfiles.com > No.1 ISA Server Resource Site: http://www.isaserver.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 MSEXchange.org Discussion List as: > johnlist@xxxxxxxxxxxxxxxxxxx > To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist > Report abuse to listadmin@xxxxxxxxxxxxxx