How to set up SPF on IONOS (1&1)

Step by step SPF setup for IONOS (1&1): complete instructions, examples, verification commands, and common pitfalls.

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This is a reference guide for configuring SPF on IONOS (1&1). Use it while editing DNS or when troubleshooting deliverability.

Tip: Here’s a reliable, copy-pasteable way to set up SPF using IONOS (1&1). Then verify everything with the InboxGreen Free Checker.

Provider-specific notes for IONOS (1&1)

  • Different dashboards label DNS fields differently. Always verify the published record using dig or a checker.
  • If records look right but still fail, it is usually caching, propagation delay, or a host name mismatch.
  • Open your email platform and DNS provider to locate the relevant screens.

What you’ll need

  • Access to your DNS provider (for example, Cloudflare, Namecheap, GoDaddy).
  • Access to IONOS (1&1) admin where you can confirm the services that send mail.

Add or update SPF

SPF is a single TXT record published at host @ that lists all systems allowed to send mail for your domain. If you already have an SPF record, edit it instead of adding a second one.

For IONOS (1&1), a typical SPF looks like:
v=spf1 include:your-sender.example ~all
If you also use another sender (for example, SendGrid), the combined record might be:
v=spf1 include:_spf.google.com include:sendgrid.net ~all
  1. Open your DNS provider and locate the existing TXT record at host @ that contains v=spf1.
  2. If it exists, edit its value and merge includes. If it does not exist, create a new TXT record:
    • Type: TXT
    • Name/Host: @
    • Value: v=spf1 include:your-sender.example ~all
  3. Prefer ~all while you are testing. Move to -all only when you are certain all real senders are covered.
  4. Save and wait for DNS propagation (often a few minutes, sometimes longer).

Verify SPF

Use any of these:

  • Run the InboxGreen checker on your domain.
  • Command line: 
    dig TXT yourdomain.com +short
nslookup -type=txt yourdomain.com

Common mistakes

  • Multiple SPF records instead of one. Always merge mechanisms into a single record.
  • Placing the record on www instead of the root @.
  • Forgetting secondary senders such as marketing or transactional tools.
  • Switching to -all too early and blocking legitimate traffic.

Related for IONOS (1&1)

quick_reference_all Set up DKIM on IONOS (1&1) quick_reference_all Set up DMARC on IONOS (1&1) quick_reference_all Set up List-Unsubscribe on IONOS (1&1)
Pro tip: Turn on InboxGreen Monitoring to check these records daily and get alerts if something breaks.

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Useful tools

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