DNS/MX issue RBläs 11/6/2008 11:53:05 AM Dear all, our problem is that certain MX/DNS resolutions are not working properly for external users trying to send us email. For example, mail users at yahoo.com are getting rejected when trying to send an email to us at "123[ at ]example.com". This mail is rejected as the user "123[ at ]WWW.example.com" as not a valid email address. It appears that YAHOO is resolving our CNAME and although people are trying to send to [ at ]example.com it is being re- solved to [ at ]WWW.example.com which our mail server rejects. Amazingly mails for example from hotmail.com, gmail.com or mail.com are working! Would be great to find here a solution and/or an expla- nation for this situation. THX, Rainer

RE: DNS/MX issue James Yeomans BSc, MCSE 11/7/2008 1:51:01 PM Hi there, where is the dns hosted for your domain? By yourselves or by a 3rd party? Whoerver is responsible for the dns needs to check the mx records for the domain. James. -- James Yeomans, BSc, MCSE Ask me directly at: http://www.justaskjames.co.uk "RBläs" wrote: [Quoted Text] > Dear all, > > our problem is that certain MX/DNS resolutions are not working > properly for > external users trying to send us email. > > For example, mail users at yahoo.com are getting rejected when trying > to send > an email to us at "123[ at ]example.com". > This mail is rejected as the user "123[ at ]WWW.example.com" as > not a valid email address. > It appears that YAHOO is resolving our CNAME and although > people are trying to send to [ at ]example.com it is being re- > solved to [ at ]WWW.example.com which our mail server rejects. > > Amazingly mails for example from hotmail.com, gmail.com or > mail.com are working! > > Would be great to find here a solution and/or an expla- > nation for this situation. > > THX, Rainer >

Re: DNS/MX issue "Lanwench [MVP - Exchange]" <lanwench[ at ]heybuddy.donotsendme.unsolicitedmailatyahoo.com> 11/7/2008 3:25:51 PM RBläs <rainer.blaes[ at ]astrium.eads.net> wrote: [Quoted Text] > Dear all, > > our problem is that certain MX/DNS resolutions are not working > properly for > external users trying to send us email. > > For example, mail users at yahoo.com are getting rejected when trying > to send > an email to us at "123[ at ]example.com". > This mail is rejected as the user "123[ at ]WWW.example.com" as > not a valid email address. > It appears that YAHOO is resolving our CNAME and although > people are trying to send to [ at ]example.com it is being re- > solved to [ at ]WWW.example.com which our mail server rejects. > > Amazingly mails for example from hotmail.com, gmail.com or > mail.com are working! > > Would be great to find here a solution and/or an expla- > nation for this situation. > > THX, Rainer What's your domain name?

RE: DNS/MX issue oz.ozugurlu 11/7/2008 9:45:03 PM hello there, Do you think this might be a spam or Backscatter issues rather than DNS ? "I BackScattered you" http://smtp25.blogspot.com/2007/05/i-backscatered-you.html --oz -- Oz Ozugurlu MVP (Exchange) MCITP (EMA), MCITP (EA),MCITP (SA) MCSE 2003, M+, S+, MCDST Security+, Project +, Server + oz[ at ]SMTp25.org http://smtp25.blogspot.com (Blog) "RBläs" wrote: [Quoted Text] > Dear all, > > our problem is that certain MX/DNS resolutions are not working > properly for > external users trying to send us email. > > For example, mail users at yahoo.com are getting rejected when trying > to send > an email to us at "123[ at ]example.com". > This mail is rejected as the user "123[ at ]WWW.example.com" as > not a valid email address. > It appears that YAHOO is resolving our CNAME and although > people are trying to send to [ at ]example.com it is being re- > solved to [ at ]WWW.example.com which our mail server rejects. > > Amazingly mails for example from hotmail.com, gmail.com or > mail.com are working! > > Would be great to find here a solution and/or an expla- > nation for this situation. > > THX, Rainer >

Re: DNS/MX issue "Ace Fekay [Microsoft Certified Trainer]" <firstnamelastname[ at ]hotmail.com> 11/8/2008 4:17:35 AM In news:55ba0b68-19fd-486e-bb9f-7939113c07e7[ at ]s9g2000prm.googlegroups.com, RBläs <rainer.blaes[ at ]astrium.eads.net> requesting assistance, typed the following: [Quoted Text] > Dear all, > > our problem is that certain MX/DNS resolutions are not working > properly for > external users trying to send us email. > > For example, mail users at yahoo.com are getting rejected when trying > to send > an email to us at "123[ at ]example.com". > This mail is rejected as the user "123[ at ]WWW.example.com" as > not a valid email address. > It appears that YAHOO is resolving our CNAME and although > people are trying to send to [ at ]example.com it is being re- > solved to [ at ]WWW.example.com which our mail server rejects. > > Amazingly mails for example from hotmail.com, gmail.com or > mail.com are working! > > Would be great to find here a solution and/or an expla- > nation for this situation. > > THX, Rainer It appears you have a wild card entry under the zone to point ALL queries to www.example.com. However this is an educated guess since I can't confirm or verify it because you did not post your domain name for us to better assist you. -- Ace This posting is provided "AS-IS" with no warranties or guarantees and confers no rights. Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCT Microsoft Certified Trainer For urgent issues, you may want to contact Microsoft PSS directly. Please check http://support.microsoft.com for regional support phone numbers.