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The message can be transferred through one or more SMTP relay server if the originating server fails to communicate with the destination server directly. The original e-mail message is transferred to the recipient server only if the user name given in the email address matches with the authorized user account and destination server. Now, on port 25 the destination SMTP server is communicated by originating SMTP server directly by Transmission Control Protocol or Internet Protocol (TCP/IP). Looking up it returns the host name of the SMTP server destined for that domain. The SMTP server starts communicating with the Domain Name System (DNS) server, based on the domain name of recipient e-mail address. The message delivery is initiated by sending the mail to SMTP server which is designated. It is a simple component used for transferring mails. Monitoring agent will be sending it and will also choose whether to PING the SMTP server during a test. There is option to choose a different email address for ‘from’ headers of the tested message. Now test by sending a message to an email address. You should choose the host and the port of your mail server while Configuring SMTP server which is used to send text messages and mails. SMTP or Simple Mail Transfer Protocol is an electronic mail’s Internet Standard for transmission of emails across Internet Protocol network.