It’s a client’s request for some information that can be useful for the a successful transfer of the email. This SMTP command asks for a confirmation about the identification of a mailing list. It communicates the server that the ongoing email transmission is going to be terminated, though the SMTP conversation won’t be closed (like in the case of QUIT). It’s another layer of security to guarantee a proper transmission.
When MAIL FROM is used with an empty address (represented as <> ), the receiving server knows not to generate a bounce message if the message is.It’s used primarily for bounce messages, to prevent an endless loop. Mail servers are required to support it ( RFC 1123 section 5.2.9 ). With the AUTH command, the client authenticates itself to the server, giving its username and password. The empty MAIL FROM is used for delivery status notifications. This command is used to invert roles between the client and the server, without the need to run a new connaction. The server is asked to verify whether a particular email address or username actually exists.
SURGEMAIL SMTP AUTHENTICATION CODE
With the DATA command the email content begins to be transferred it’s generally followed by a 354 reply code given by the server, giving the permission to start the actual transmission. It can also be used to report the maximum size of a message to be accepted by the server. This SMTP command informs the remote server about the estimated size (in terms of bytes) of the attached email. It identifies the recipient of the email if there are more than one, the command is simply repeated address by address. With this SMTP command the operations begin: the sender states the source email address in the “From” field and actually starts the email transfer. It’s the first SMTP command: is starts the conversation identifying the sender server and is generally followed by its domain name.Īn alternative command to start the conversation, underlying that the server is using the Extended SMTP protocol.
Each command is used in a normal communication sequence between two servers through the SMTP protocol, in order to deliver emails. In this article you will find a list of the most important SMTP commands with a short explanation.
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