Email deliverability is about whether your messages reach inboxes reliably. For a business website, this affects contact form notifications, password resets, invoices, booking confirmations, and customer replies.
Use the Right Sender
Website mail should usually come from an address on your own domain, such as [email protected]. Put the visitor's address in reply-to, not in the sender field.
Set SPF
SPF tells receiving servers which systems are allowed to send mail for your domain. Include your mail provider and any service that legitimately sends on your behalf.
Enable DKIM
DKIM signs outgoing messages. Your email provider will give you the DNS record. Add it and verify it inside the provider's dashboard.
Add DMARC
DMARC builds on SPF and DKIM. Start with a cautious policy if you are unsure, then tighten once you understand every service that sends mail for the domain.
Use SMTP for Websites
For WordPress and other CMS forms, authenticated SMTP is usually more reliable than basic PHP mail. Use a reputable SMTP service or your mail provider's SMTP settings.
If form mail is unreliable, check DNS authentication, SMTP settings, logs, and whether the message content itself looks spammy.
