SPF for subdomain

subdomain spf
Igor picture Igor · Jul 31, 2017 · Viewed 11.7k times · Source

I need to configure SPF record for a subdomain.

DNS for the main domain (I use Google Mail):

IN MX 1   aspmx.l.google.com.
IN MX 10  aspmx3.googlemail.com.
IN MX 10  aspmx5.googlemail.com.
IN MX 10  aspmx4.googlemail.com.
IN MX 10  aspmx2.googlemail.com.
IN MX 5   alt1.aspmx.l.google.com.
IN MX 5   alt2.aspmx.l.google.com.

IN TXT    "v=spf1 ip4:xx.xxx.xxx.xx include:_spf.google.com ~all"

mysubdomain IN A xxx.xxx.xxx.xxx

But how to set SPF for mysubdomain.example.com ? I will send email newsletter from this subdomain using phpmail.

Also online email checkers show warning that there is no MX record for my subdomain.

Answer

Synchro picture Synchro · Jul 31, 2017

Just add the subdomain in front of the SPF record:

mysubdomain IN TXT    "v=spf1 ip4:xx.xxx.xxx.xx include:_spf.google.com ~all"

Similarly, you can set a separate MX, though you don't necessarily need one if it's the same as for the domain:

mysubdomain IN MX 1   aspmx.l.google.com.
mysubdomain IN MX 10  aspmx3.googlemail.com.

Related questions

search for ALL DNS TXT records of a domain and subdomains

There is a way to retrieve ALL (TXT) entries about DNS records of a domain (and subdomains) ? My goal is to verify the configuration of my domain: www.rosposhop.com where I correctly set multiple SPF and DKIM records for …

Read More
How do I get a list of all subdomains of a domain?

I want to find out all the subdomains of a given domain. I found a hint which tells me to dig the authoritative Nameserver with the following option: dig @ns1.foo.bar some_domain.com axfr But this never works. …

Read More
Share cookie between subdomain and domain

I have two questions. I understand that if I specify the domain as .mydomain.com (with the leading dot) in the cookie that all subdomains can share a cookie. Can subdomain.mydomain.com access a cookie created in mydomain.com (…

Read More