By using a custom domain with Microsoft 365, you can both strengthen your brand credibility and improve your email reputation. This increases the chances of your emails reaching their recipients without getting caught in spam filters, which may depend on the email provider you use. Another important aspect is the protection against domain poaching, where attackers try to take over or spoof your domain to mislead recipients and cause damage. Microsoft 365 offers powerful security tools like DMARC (Domain-based Message Authentication, Reporting, and Conformance) and SPF (Sender Policy Framework), which make it significantly more difficult for cybercriminals to carry out domain spoofing. According to Microsoft, DMARC helps to significantly reduce the risk of fake emails reaching users, which in turn protects both businesses and customers from fraud and identity theft.