SMTP Vs ESMTP

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Following trends of my previous posts Differences IPv4 Vs IPv6, Differences Routing Vs Routed protocol and Load Testing Vs Stress Testing below is another one for differences between SMTP Vs ESMTP.

SMTP

ESMTP
Stands for Simple Mail Transfer Protocol Stands for Extended Simple Mail Transfer Protocol
The first command in the SMTP session:
HELO techsutram.com		 The first command in the ESMTP session:
EHLO techsutram.com
RFC 821 RFC 1869
SMTP ‘MAIL FROM’ and “RCPT TO’ allows size only of 512 characters including <CRLF>. ESMTP ‘MAIL FROM’ and “RCPT TO’ allow a size greater than 512 characters.
SMTP alone cannot be extended with new commands. ESMTP is a framework that enhances the capability to extend existing SMTP commands

If you are aware of any improvements to the above differences or want to add to the above list then please post your comments below.

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Mandar is a seasoned software professional for more than a decade. He is Cloud, AI, IoT, Blockchain and Fintech enthusiast. He writes to benefit others from his experiences. His overall goal is to help people learn about the Cloud, AI, IoT, Blockchain and Fintech and the effects they will have economically and socially in the future.

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