How to Fix Gmail Spam Issues After Moving Domains to Google Workspace

You migrated your email from another provider to Google Workspace. Before the migration, deliverability was fine. After moving to Google Workspace, your emails are going to spam on Gmail or other providers. Nothing about your email content changed. Only the sending infrastructure changed.

Why this happens

When you move to Google Workspace, your MX records change, your sending IP changes, and your DNS records need to be reconfigured for the new infrastructure. If any part of this migration is incomplete, your authentication breaks silently — your ESP shows emails as sent, but receiving servers are rejecting authentication.

Common causes after a migration:

• SPF still references your old email provider. Your SPF record must include Google Workspace's servers using include:_spf.google.com. Without this, emails sent from GWS fail SPF checks.
• DKIM was never set up for GWS. You need to generate new DKIM keys in the Google Admin console and add them to your DNS. The old provider's DKIM key does not work with GWS's sending infrastructure.
• DMARC alignment broke. After migration, if SPF and DKIM are not both correctly configured for GWS, DMARC fails even if individual checks pass on the old system.
• Reputation doesn't transfer. Your domain had reputation signals tied to your old IP addresses. Those signals do not transfer to Google Workspace's IP pool. You are essentially starting fresh on the new infrastructure.

Step-by-step diagnosis

Step 1: Verify SPF includes Google Workspace

Your SPF record must contain include:_spf.google.com. Check with the SPF checker. If the include is missing, add it. If you have the wrong include value from the old provider still in place, update it.

Step 2: Generate and publish DKIM keys in GWS

Go to Google Admin Console → Apps → Google Workspace → Gmail → Authenticate email. Generate the key for your domain and add the TXT record to your DNS. Google recommends 2048-bit keys. Verify publication with the DKIM checker — check the "google" selector.

Step 3: Verify DMARC alignment

Send a test email and look at the original headers. DMARC requires alignment between the From domain and either the SPF domain or the DKIM domain. Check with the DMARC lookup.

Step 4: Allow DNS propagation

Allow 48–72 hours for DNS propagation after making changes. Test deliverability after propagation is complete, not during it. Use the inbox placement test to confirm end-to-end authentication results.

The fix path

Update all DNS records to reference Google Workspace infrastructure. Remove references to your old provider unless you still actively send from them. Ensure only one SPF record exists on the domain.

Set up DKIM in Google Workspace and publish the key. This is the most commonly missed step in migrations because the old DKIM key simply does not work with GWS's sending infrastructure.

Monitor Postmaster Tools after migration. Your domain reputation may start as unknown on Google's infrastructure even if it was established before. Treat the first 2–4 weeks after migration like a warmup period, sending at lower volume and prioritizing engaged recipients.

Repair or replace?

This is almost always repairable. Migration-related spam issues are usually caused by DNS misconfiguration that can be fixed in hours. Once SPF, DKIM, and DMARC are correctly set up for Google Workspace, deliverability should recover within a few days to a week.

If your domain had reputation problems before the migration, the move to Google Workspace will not fix those. Address the underlying reputation issues separately.