If you run a business in Milton Keynes, you may have seen invoices ignored, booking confirmations land in junk folders or client replies bounce. Major mailbox providers now apply stricter sender requirements and increasingly sophisticated spam filtering.
Spam complaint rates: what 0.3% actually means
Google recommends keeping user-reported spam rates below 0.1% and avoiding 0.3% or higher. The effect is graduated rather than an automatic block of every message, but high complaint rates can seriously damage inbox placement and, for bulk senders, access to delivery mitigations. See Google's current sender-guidelines FAQ.
Even legitimate, requested business communications can still reach spam when a domain lacks appropriate authentication records. Without them, automated filters have less evidence that a message genuinely came from your business.
The Three Pillars of Email Authentication
To prevent your domain from being flagged, you need to configure three specific DNS records at your domain registrar. Think of these as a digital passport for your domain:
1. SPF (Sender Policy Framework)
An SPF record is a list on your domain name configuration that explicitly tells mail servers which servers (like Google Workspace, Microsoft 365, or Mailchimp) are actually allowed to send emails on your behalf.
2. DKIM (DomainKeys Identified Mail)
DKIM acts as a digital signature. It cryptographically signs every email you send with a secure key, proving to the receiving server that the email wasn't tampered with or forged in transit.
3. DMARC (Domain Message Authentication & Reporting)
DMARC is the instruction manual. It tells Gmail or Outlook exactly what to do if an email fails the SPF or DKIM check (either do nothing, quarantine it in spam, or reject it outright), and sends you reports of failures.
How Milton Keynes SMEs Can Check Their Status
You don't need to be an IT guru to find out if your setup is broken. We have created a completely free diagnostic checker to test your domain for these records.
Simply head to our Free Email Health Checker and enter your domain. It will scan your DNS settings instantly and flag any missing authentication blocks.
For a broader, evergreen explanation of reputation, message content and authentication, read our business email deliverability guide.
Practical Next Steps
- Consolidate your senders: Audit all platforms sending emails under your domain (accounting software like Xero, CRM tools, booking systems).
- Update SPF: Ensure Xero or other platforms are explicitly included in your SPF DNS record.
- Enable DKIM: Generate and add DKIM public keys from your Google Workspace or Microsoft 365 admin portals.
- Start DMARC gently: Deploy a basic
p=none(monitoring only) policy before hardening it to avoid blocking legitimate emails.
Email Health Setup
Are your invoices going to junk?
We help local Milton Keynes businesses set up robust email authentication (SPF, DKIM, DMARC) to ensure their emails reach customers. Get in touch to clean up your deliverability.
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