SMTP Status Data Is a Decision System, Not Just an Error Log
Open dataset of 92 SMTP status codes for classifying delivery outcomes, processing bounces, and building reliable email tools.
SMTP status codes like 250, 451, and 550 offer more than just success or failure signals; they provide crucial inputs for decision-making in email delivery systems. The Open SMTP Error Dataset is a structured reference that interprets these outcomes consistently, offering JSONL, CSV, and Parquet formats for easy use. Each record links a status code with categories such as successful delivery, temporary conditions, or permanent failures, along with diagnostic information and suggested actions.
The key is using the enhanced status code first for precise classification, then considering factors like queue age, retry limits, and recipient history for nuanced handling. While diagnostic text can guide investigations, it should not replace codes or lead to irreversible decisions. The dataset, comprising 92 records, serves developers, email platforms, and observability tools, allowing them to track issues like temporary conditions or authentication errors separately from permanent delivery failures.
By extracting the enhanced status code and applying the dataset's rules, systems can achieve cleaner reporting and tailored handling, moving beyond a generic "email failed" metric. The dataset is available on Hugging Face, Zenodo, and an interactive catalog for easy access and implementation.
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