What is ESMTP SIZE clause?

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How and why is an e-mail rejected because of its size?


The sending server can state the size of the message it is about to send. This way if there is a maximum account setting on the receiving server, it can refuse the e-mail and quit the current connection.
The main difference between this approach and the “account size constraints” in GMS Webmail is that ESMTP SIZE acts on the protocol level of e-mail transaction meaning that the message is not even be sent out so preserving network bandwidth.

It is worth noting that this isnt 100% efficient as mail servers are able to “lie” about the size of a message they wish to send.

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