Domain verification is a required step to confirm ownership of a domain.
After you verify a domain in your account, you will be able to send all email notifications from your StatusHub using this domain.
Regardless of how you send email (and which ESP you might use), you will need to set up SPF and DKIM. See our guide on how you should set up DKIM and SPF here.
If you do not verify your domain, sender domains will not be used in "From:" mail field and instead default "firstname.lastname@example.org" will be used. However, in that case, your custom email will be used in "Reply-To:" field.