SMTP Resources

Requests, verbs, parameters, responses, and codes
RFC1891 SMTP Service Extension for Delivery Status Notifications
RFC2821 Simple Mail Transfer Protocol
RFC2822 Internet Message Format
RFC821 Simple Mail Transfer Protocol
RFC822 Standard for the Format of ARPA Internet Text Messages
SMTP Inside Out How internet email works
The Simple Mail Transfer Protocol, and how it works
X-Net SMTP Tutorial

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