Email Sending Domain

This article explains the complexities surrounding editing your domain including SPF, DKIM, Spam & Whitelists.

All FlatrateNOW emails are sent using our dedicated email domain of


You can use your own domain email as the sending email address, but Email sending domains are an advanced feature that will require you to edit DNS and mail server settings.


This can involve complexities. FlatrateNOW cannot provide guidance and cannot change your computer systems for you. 

If you do use your own sending domains, you must ensure that the settings are always valid. FlatRateNOW cannot assistance for any delivery issues.


Here is some information relating to editing your DNS and mail server settings.


Email Sender Policy Framework (SPF) & DKIM

Sender Policy Framework (SPF) and Domain Keys Identified Mail (DKIM) are ways for a receiving mail server to verify email messages as authentic to help prevent spam.

Your own domain
We are only able to send authorised emails if you have your own domain name, e.g. We are unable to send emails on behalf of other company emails like;

  • etc, etc.

This also affects using your ISP’s (Internet Service Provider) free provided emails (e.g. ,, etc.)


Spam and Whitelists

Even though clients go through this process they may have clients using Office365 that may require our mail server IPs added to their whitelist or they may need to adjust their spam policy. We have links to documentation here:

Sometimes receiving email servers or anti-spam software interpret email sent “on behalf of” as spam and this can prevent the email from being delivered.


Sender Policy Framework (SPF) is an email authentication method designed to detect forging sender addresses during the delivery of the email.[1] SPF alone, though, is limited to detecting a forged sender claim in the envelope of the email, which is used when the mail gets bounced.[1]

SPF allows the receiving mail server to check during mail delivery that a mail claiming to come from a specific domain is submitted by an IP address authorized by that domain's administrators.[3] The list of authorized sending hosts and IP addresses for a domain is published in the DNS records for that domain.

For more information about SPF, please see the Sender Policy Framework Wikipedia article.


Domain Keys Identified Mail is an email authentication method designed to detect forged sender addresses in email, a technique often used in phishing and email spam. DKIM allows the receiver to check that an email claimed to have come from a specific domain was indeed authorized by the owner of that domain.

DKIM is configured by adding the appropriate digital signature key as a TXT record on the DNS server.

For more information about DKIM, please see the Domain Keys Identified Mail Wikipedia article.