We've updated our mail servers used to send emails for the ATS.
Due to this, there may be a change in the current SPF record that is added to your domain records.
The previous SPF record is v=spf1 include:mailgun.org ~all
The new current one is v=spf1 include:spf2.accessacloud.com ~all
Your IT will be able to assist with the above. Action this to avoid any deliverability issues with ATS emails.