No, it wouldnt. Spam filters arent interested in CNAME records. They examine, A, MX, and PTR.
Once upon a time I actually blogged about this. It may be of help to you: http://www.espinola.net/blog/archives/5 On Wed, May 28, 2008 at 1:53 PM, N Parr <[EMAIL PROTECTED]> wrote: > That's exactly my concern and why I thought of it because I have my > filter set up the same way. Problem is I'm limited on my provider > choices. A CNAME record wouldn't work for this would it? From what > I've read it's a bad thing to mix MX with cnames. > > -----Original Message----- > From: Micheal Espinola Jr [mailto:[EMAIL PROTECTED] > Sent: Wednesday, May 28, 2008 12:46 PM > To: NT System Admin Issues > Subject: Re: Reverse DNS Advice for outbound email > > I would change providers. There are words in our PTR that can trigger > spam filters. Words like, "pool", etc... At least its not based on an > IP or MAC address, but its still a risk. > > > On Wed, May 28, 2008 at 1:38 PM, N Parr <[EMAIL PROTECTED]> > wrote: >> We host our own email and we are changing our primary ISP. Per their >> policy they will not change the Reverse DNS of our static IP to be >> anything other than mortonrb-pool5-static-4.ispxxx.com. I have >> control of my DNS records and can set that as an MX but I'm kind of >> worried about some spam filters having issues with such a long DNS >> name with the word "pool" in it when trying to send mail. Using their > >> mail server as a smart host is out of the question because if they go >> down our ASA box will automatically fail over to our secondary ISP and > >> be unable to connect to their down mail server. Do you think using >> this long DNS name will cause issues trying to send outbound email. >> BTW my DNS is hosted with network solutions and they don't support TXT > >> records so I can't create an SPF. >> Thanks >> Niles >> >> ~ Upgrade to Next Generation Antispam/Antivirus with Ninja! ~ >> ~ <http://www.sunbelt-software.com/SunbeltMessagingNinja.cfm> ~ >> > > > > -- > ME2 > > ~ Upgrade to Next Generation Antispam/Antivirus with Ninja! ~ > ~ <http://www.sunbelt-software.com/SunbeltMessagingNinja.cfm> ~ > > > ~ Upgrade to Next Generation Antispam/Antivirus with Ninja! ~ > ~ <http://www.sunbelt-software.com/SunbeltMessagingNinja.cfm> ~ > -- ME2 ~ Upgrade to Next Generation Antispam/Antivirus with Ninja! ~ ~ <http://www.sunbelt-software.com/SunbeltMessagingNinja.cfm> ~
