Issues with email delivery may stem from mismatched DNS records. MXToolbox shows correct DKIM and DMARC settings, but Google Admin Toolbox indicates they are not set up. The SPF record shows an error which could be a primary cause for emails not reaching recipients. It's essential to ensure the SPF record includes all valid sending domains. A restrictive SPF configuration using '-all' may result in email delivery problems if not all senders are accounted for.
For proper functioning, ensure DNS records are consistently configured in both MXToolbox and Google Admin Toolbox. Disparities may indicate misconfigurations affecting email delivery.
The SPF record should include all authorized sending servers. The use of '-all' restricts unauthorized senders. Review all sending services to avoid delivery issues.
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