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Setting up a subdomain in your Business Account
Last modified on 20 April 2018 07:55 PM

This support article refers to the DNS settings of the subdomain, at least one layer lower than the domain you have registered at your domain host.

Subdomains need different domain host instructions than regular root domains. A subdomain is a domain that is part of a larger domain; the only domain that is not also a subdomain is the root domain. For example, sub.example.com and subdomain.example.com are subdomains of the example.com domain, which in turn is a subdomain of the com top-level domain (TLD).

See below how subdomains need to be entered into your host’s DNS configuration. Please note the trailing period in the NAME fields.

When verifying your domain, enter the following information:

Record Type

Name

Value

TTL

TXT

subdomain.yourdomain.com.

startmail-verification=[personal token]

600

When setting up the MX records, enter the following information:

 Record Type

Name

Value

Priority

TTL

MX

subdomain.yourdomain.com.

mx1.smtp.startmail.com

10

600

MX

subdomain.yourdomain.com.

mx2.smtp.startmail.com

10

600

MX

subdomain.yourdomain.com.

smx-5c0.smtp.startmail.com

20

600


When setting up your spf records, enter the following information:

Record Type

Name

Value

TTL

TXT

subdomain.yourdomain.com.

v=spf1 include:spf.startmail.com ~all

600

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