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HomeGlossaryEnhanced Status Codes: The 2.1.5, 4.2.2, 5.1.1 Format Explained

Enhanced Status Codes: The 2.1.5, 4.2.2, 5.1.1 Format Explained

Enhanced Status Codes: The 2.1.5, 4.2.2, 5.1.1 Format Explained glossary thumbnail

Enhanced status codes add detail beyond basic SMTP codes. Learn how to interpret them for bounces and troubleshooting.

Enhanced status codes provide more specific classification than basic SMTP codes. They look like 5.1.1 and help identify the exact failure category.

They’re useful for automated bounce handling and analytics. When you build tools, enhanced codes help you label outcomes more accurately across providers.

Related Keywords
enhanced status codessmtp enhanced codes5.1.14.2.2dsn enhanced codes
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