10/28/2022 0 Comments Microsoft spam filter hyphen![]() The RCPT TO command specifies the recipient. Optional parameters may also be specified. For some types of reporting messages like non-delivery notifications, the reverse-path may be void. As an argument, MAIL FROM includes a sender mailbox (reverse-path). The MAIL FROM command initiates a mail transfer. In any case, HELO or EHLO is a MUST command for the SMTP client to commence a mail transfer. If the server does not support ESMTP, it will reply with an error. As a rule, HELO is attributed with an argument that specifies the domain name or IP address of the SMTP client.ĮHLO is an alternative to HELO for servers that support the SMTP service extensions (ESMTP). The client greets the server and introduces itself. The HELO command initiates the SMTP session conversation. Therefore, we decided to list the SMTP commands according to this flow. email transfer – manipulations with the email.handshake – establishing a TCP connection.Essential SMTP commands in the order they may be usedĮach SMTP command defines a particular function within the SMTP session, which consists of three steps: Also, we’ll shed light on which response codes correspond to each command. You’ll find out the valid SMTP commands and the obsolete ones. ![]() The server responses with numerical codes. The client talks using commands that consist of alphabetical characters. POP3, we explained that an SMTP session is a sort of a conversation between an SMTP client and an SMTP server.
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