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44 lines
1.9 KiB
Markdown
44 lines
1.9 KiB
Markdown
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# SMTP - Commands
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**Extracted from:** [**https://serversmtp.com/smtp-commands/**](https://serversmtp.com/smtp-commands/)\*\*\*\*
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**HELO**
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It’s the first SMTP command: is starts the conversation identifying the sender server and is generally followed by its domain name.
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**EHLO**
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An alternative command to start the conversation, underlying that the server is using the Extended SMTP protocol.
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**MAIL FROM**
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With this SMTP command the operations begin: the sender states the source email address in the “From” field and actually starts the email transfer.
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**RCPT TO**
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It identifies the recipient of the email; if there are more than one, the command is simply repeated address by address.
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**SIZE**
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This SMTP command informs the remote server about the estimated size \(in terms of bytes\) of the attached email. It can also be used to report the maximum size of a message to be accepted by the server.
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**DATA**
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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.
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**VRFY**
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The server is asked to verify whether a particular email address or username actually exists.
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**TURN**
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This command is used to invert roles between the client and the server, without the need to run a new connaction.
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**AUTH**
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With the AUTH command, the client authenticates itself to the server, giving its username and password. It’s another layer of security to guarantee a proper transmission.
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**RSET**
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It communicates the server that the ongoing email transmission is going to be terminated, though the SMTP conversation won’t be closed \(like in the case of QUIT\).
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**EXPN**
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This SMTP command asks for a confirmation about the identification of a mailing list.
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**HELP**
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It’s a client’s request for some information that can be useful for the a successful transfer of the email.
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**QUIT**
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It terminates the SMTP conversation.
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