Q Can I send emails from my own domain?

Before sending emails from their domain, they need to set up the following SPF records in their Domain DNS Settings:

include:_spf.kooomo.com include:168.245.96.90

To check if the record is then correct, you can see in this page:

https://mxtoolbox.com/SuperTool.aspx?action=spf%3awww.celtictweeds.ie&run=toolpage