Subdomain for GAE and GMail

[pdconant]

Is it possible to use the same subdomain for both a Google App Engine app and for GMail?  For instance, imagine I wanted to have http://myapp.mycompany.com served by GAE and also use email address m...@myapp.mycompany.com.  For the GAE app, I'd need a CNAME pointing myapp.mycompany.com to "ghs.googlehosted.com."; and for GMail to work, I'd need MX records for "myapp.mycompany.com".  But I don't believe I can have CNAME and MX records for the same subdomain. I'm no DNS expert -- I hope I'm missing something obvious to those more knowledgeable than myself.  Any ideas?

Thanks

P.

[Vinny P]

On Mon, Apr 7, 2014 at 10:44 PM, pdconant <patrick...@gmail.com> wrote:

Is it possible to use the same subdomain for both a Google App Engine app and for GMail?  For instance, imagine I wanted to have http://myapp.mycompany.com served by GAE and also use email address m...@myapp.mycompany.com.  For the GAE app, I'd need a CNAME pointing myapp.mycompany.com to "ghs.googlehosted.com."; and for GMail to work, I'd need MX records for "myapp.mycompany.com".  But I don't believe I can have CNAME and MX records for the same subdomain. I'm no DNS expert -- I hope I'm missing something obvious to those more knowledgeable than myself.  Any ideas?

 As you noted, it's difficult to have both a CNAME and MX records for the same subdomain. Here's a detailed explanation of the issue: http://serverfault.com/questions/18000/dns-subdomains-that-require-both-an-mx-record-and-a-cname 

Unfortunately there's no way to avoid this problem, other than to violate best practices and RFCs (as the link above describes). You'll have to find a different way to issue email addresses - for example, you could do me.m...@mycompany.com, me+m...@mycompany.com, or purchase a whole different domain name for email and do m...@uniqueappandcompanyname.com 

 

 

-----------------

-Vinny P

Technology & Media Advisor

Chicago, IL

App Engine Code Samples: http://www.learntogoogleit.com

[Barry Hunter]

On 10 April 2014 10:19, Vinny P <vinn...@gmail.com> wrote:

On Mon, Apr 7, 2014 at 10:44 PM, pdconant <patrick...@gmail.com> wrote:

Is it possible to use the same subdomain for both a Google App Engine app and for GMail?  For instance, imagine I wanted to have http://myapp.mycompany.com served by GAE and also use email address m...@myapp.mycompany.com.  For the GAE app, I'd need a CNAME pointing myapp.mycompany.com to "ghs.googlehosted.com."; and for GMail to work, I'd need MX records for "myapp.mycompany.com".  But I don't believe I can have CNAME and MX records for the same subdomain. I'm no DNS expert -- I hope I'm missing something obvious to those more knowledgeable than myself.  Any ideas?

 As you noted, it's difficult to have both a CNAME and MX records for the same subdomain. Here's a detailed explanation of the issue: http://serverfault.com/questions/18000/dns-subdomains-that-require-both-an-mx-record-and-a-cname 

Unfortunately there's no way to avoid this problem,

Or can just find a DNS provider that supports ALIAS records (sort of fake CNAMES, where the nameserver does the resolution, rather than a just returning a pointer) 

http://blog.cloudflare.com/introducing-cname-flattening-rfc-compliant-cnames-at-a-domains-root

http://support.dnsimple.com/articles/differences-between-a-cname-alias-url/

http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/CreatingAliasRRSets.html

[patrick conant]

Thanks, Vinny and Barry.  I followed the pointer to DNSimple, and confirmed that they'll be able to meet my needs with a DNS Alias. Perfect!  I appreciate the help.

-Pat.

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