Have there been any recent DNS changes? Are the originals still cached? Since you aren't using SPF, I cant only deduce that this type of verification is is DNS related.
ohh, wait a tick - maybe the "verification" is checking for the existence of a postmaster, or abuse address on your server. Some filters do that too. Worth looking into and creating if they don't currently exist. These types of checks are called "RFC Ignorant" checks - because by RFC standards, these addresses should exist. There is also a DNSBL that tracks RFC Ignorant address. HTH On Feb 8, 2008 2:37 PM, Micheal Espinola Jr <[EMAIL PROTECTED]> wrote: > ... most *likely > > On Feb 8, 2008 2:30 PM, Micheal Espinola Jr <[EMAIL PROTECTED]> wrote: > > > The problem is most like in regards to how your A, MX and PTR records > > are configured. Without knowing the specifics of your domain, I cant > > really comment further on what is wrong. But the information here > > might be helpful: > > > > http://www.espinola.net/blog/archives/5 > > > > > > On Feb 8, 2008 2:14 PM, Dean E. Lahodny <[EMAIL PROTECTED]> wrote: > > > > > Yes we have a Reverse DNS record in place. No, we don't have SPF set up > > > at the domain where the issue exists. > > > > > > E-mails from my domain, harrisranch.com, make it to the problematic > > > domain without getting the Verification failed NDR and I don't have SPF > > > setup either. But I also have a SMTP content filter between our > > > Exchange server and the internet where our other company doesn't. > > > > > > > > > -----Original Message----- > > > From: Dahl, Peter [mailto:[EMAIL PROTECTED] > > > Sent: Friday, February 08, 2008 10:27 AM > > > To: MS-Exchange Admin Issues > > > Subject: RE: 550-Verification failed for > > > > > > Do you have Reverse DNS records for the sending e-mail domain? What > > > about SPF? Maybe the recipient is looking for those to verify the > > > connection before accepting messages from your server. > > > > > > -----Original Message----- > > > From: Dean E. Lahodny [mailto:[EMAIL PROTECTED] > > > Sent: Thursday, February 07, 2008 6:51 PM > > > To: MS-Exchange Admin Issues > > > Subject: RE: 550-Verification failed for > > > > > > Thanks for the information. > > > > > > I was able to get access to the Exchange server and I made the change, > > > restarted the SMTP virtual service, and when I telnet to port 25 using > > > the FQDN and not the IP address I get the FQDN name banners as expected > > > but when I send an e-mail to the other domain I still get the > > > 'Verification failed for. > > > > > > > > > There was a SMTP communication problem with the recipient's email > > > server. Please contact your system administrator. > > > <mail.domain.com #5.5.0 smtp;550-Verification failed for > > > <[EMAIL PROTECTED]>> > > > > > > I'll keep looking but if anyone has any other ideas I would appreciate > > > the help. > > > > > > > > > -----Original Message----- > > > From: Micheal Espinola Jr [mailto:[EMAIL PROTECTED] > > > Sent: Thursday, February 07, 2008 2:42 PM > > > To: MS-Exchange Admin Issues > > > Subject: Re: 550-Verification failed for > > > > > > You need to effect a change to the SMTP banner greeting. You can find > > > the setting here: > > > > > > * ESM > > > -> SMTP virtual server properties > > > -> Delivery tab > > > -> Advanced.. button > > > -> Fully-qualified domain name (set this to reflect a valid public FQDN) > > > > > > > > > On Feb 7, 2008 4:30 PM, Dean Lahodny <[EMAIL PROTECTED]> wrote: > > > > One of our other companies, for whom I didn't set up the Exchange > > > server, don't have control over, but have to tell them how to fix > > > problems, is getting the following NDR when they send to or reply to > > > e-mail at one specific domain. > > > > > > > > There was a SMTP communication problem with the recipient's email > > > server. Please contact your system administrator. > > > > <server.domain.local #5.5.0 smtp;550-Verification failed for > > > > <[EMAIL PROTECTED]>> > > > > > > > > The receiving domain the e-mail is being sent to is using Exim mail > > > server software. > > > > > > > > After doing some research I am fairly certain the NDR is being caused > > > by the Exchange server returning server.domain.local rather than > > > mail.domain.com. But I haven't figured out how to get Exchange to > > > return the correct name. > > > > > > > > How do I get the Exchange server to return the correct DNS name? > > > > > > > > > > > > ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ > > > > ~ http://www.sunbeltsoftware.com/Ninja ~ > > > > > > > > > > > > > > > > -- > > > ME2 > > > > > > ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ > > > ~ http://www.sunbeltsoftware.com/Ninja ~ > > > > > > *This email message is intended only for the use of the individual or > > > entity to which it is addressed and may contain information that is > > > privileged, confidential, or exempt from disclosure under applicable > > > law. If you are not the intended recipient, any dissemination, > > > distribution or copying of this communication is strictly prohibited. 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