No SPF record

SPF (Sender Policy Framework) is a setting in your domain's DNS that tells email servers which services are authorised to send email on your behalf. Without SPF, anyone on the internet can send emails that appear to come from your domain. This enables phishing scams using your brand name and can cause your own emails to land in recipients' spam folders. Ask your website host or IT provider to add an SPF record to your domain's DNS settings. If you use Google Workspace or Gmail, the value is: v=spf1 include:_spf.google.com -all. If you use another email provider, include their specific value too.