Major email providers have tightened requirements for senders, particularly bulk senders. Gmail and Yahoo require proper authentication, easy unsubscribe options and low spam complaint rates for high-volume senders. Even small businesses benefit from setting these up correctly.
SPF
SPF (Sender Policy Framework) is a DNS record listing which servers may send email for your domain — for example Google Workspace, Zoho Mail, your website server and your newsletter tool.
DKIM
DKIM adds a digital signature to your emails. Receiving servers check the signature against a public key in your DNS to confirm the message was not altered and genuinely came from your domain.
DMARC
DMARC tells receiving servers what to do when SPF or DKIM checks fail, and sends you reports. Start with a monitoring policy, review reports, and gradually move to stricter enforcement once all legitimate senders are authenticated.
Common mistakes
- Multiple SPF records instead of one combined record
- Forgetting to authenticate the newsletter or CRM tool
- Sending marketing emails from a free Gmail address
- Buying email lists — a fast route to spam folders
Best practices
- Send newsletters from a subdomain if volumes are high.
- Include a clear unsubscribe link.
- Clean your list regularly and remove bounced addresses.
- Warm up new sending domains gradually.
FAQs
Do small businesses need DMARC?
It is strongly recommended for everyone and required for bulk senders by major providers.
Will this fix all spam issues?
Authentication is essential, but content quality and list hygiene also matter.
Can you set this up for us?
Yes, we configure DNS records for your domain and email tools.
