DNS and Email Delivery Problems Explained Simply

Email delivery problems often come back to DNS — the system that tells the internet where your email should go and whether it can be trusted. The good news is that most delivery issues are specific and fixable.

The pieces, in plain English

• DNS — the directory that connects a domain name to its settings.
• MX — the record that says which server receives your email.
• SPF — says which servers are allowed to send email for your domain.
• DKIM — adds a signature so receiving servers can check the email was not altered.
• DMARC — tells receiving servers what to do when SPF or DKIM fail.
• Nameservers — where your DNS records actually live.
• Propagation — the delay while a DNS change spreads around the internet.

Common symptoms and causes

• Email goes to spam — usually SPF, DKIM or DMARC records that are missing or wrong.
• Email bounces — often a missing or misconfigured MX record.
• Some recipients do not get mail — can be reputation or authentication.
• Email works but the contact form does not — a separate sending setup.

Not every mail problem is DNS. A misconfigured mailbox, a full inbox, a spam filter, or a sending-service limit can also be the cause. We diagnose before changing records.

No dangerous instructions

This guide explains the concepts rather than walking you through editing records. Getting SPF or MX wrong can stop mail entirely, so changes should be made carefully and tested.

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