You may have had some sort of system update or server change which has resulted in the required settings being lost on your website.
DKIM is used so that Ezekia is able to send emails with your email domain on your behalf. All day-to-day emails are sent via your Outlook account, so we only use the DKIM settings for 'system' type emails such as GDPR notifications, password notifications, and new user & client portal invites. If DKIM is not set up, these invitations will come from 'ezekia.com'. If it is set up, the notifications will appear to come from your firm.
Setting up your DKIM email will also lower the likelihood of your firm's notification emails being marked as spam by email systems, so it is recommended that you do complete the configuration for it. The DKIM details are contained in the Settings/Integrations page. Someone with access to your firm's website settings will need to make the amendments detailed there.
This video explains the DKIM process: