What you are probably seeing
Your email placement rate drops the day after a provider migration, even though no error messages appear in your sending dashboard.
Marketing reports show increased bounces and complaints, but the underlying cause is not visible in standard spam folder analyses.
Why it happens
Email providers validate sender identity by checking if the IP address matches the ones authorized in your DNS records.
When you switch hosting or add a new mail service, the old IP range remains in your SPF record, causing validation failures.
What changed recently
Step by step
1. Run a DNS lookup on your SPF, DKIM, and DMARC records to list every authorized IP address.
2. Compare that list against the actual outbound IP ranges used by your current email service providers.
3. Remove outdated IP addresses from the SPF record to stay under the 10-DNS-lookup limit.
4. Verify that your DKIM signature key is still active and matches the selector in your DNS configuration.
5. Set up monitoring to alert your team whenever a new IP is added to your sending infrastructure.
Ways to go further
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