SPF, DKIM and DMARC are three records configured on an email domain to stop anyone from sending messages that impersonate your company. SPF lists the servers allowed to send on your behalf, DKIM signs each message to prove it wasn't altered and DMARC defines what to do with email that fails both checks. Together they protect your brand and improve delivery of your legitimate email.
How TecnetOne handles it: Microsoft 365
email authentication, email domain protection, SPF record, DKIM, DMARC