SMTP commands are a set of commands which form the internet standard Simple Mail Transfer Protocol (SMTP) for electronic mail transmission. The extended version SMTP was released recently with new set of extended SMTP commands. It is this set that is used widely these days. SMTP protocol is mainly used to define the outgoing mail protocols and uses the TCP 25 port. The SMTP protocol was developed in the 1980’s by Jon Postel and since then it has been proven to be an effective email protocol when compared to FTP and Mail protocol.
Email transmissions are the most popular way of communication in today’s world and it has taken over all other communications like telephone and fax. People love to use the mail service that is fast and smooth. All mail clients are controlled by SMTP commands. For the expansion of any email service, it is very necessary to provide top class service to the existent clients and to pull in newer clients. SMTP commands and protocol was developed to meet this requirement for high quality mail transmission with the utmost speed and quality. With the newer version and further advancements, mail sending has become less anticipatory.
SMTP commands are easy to understand and works like most other text based protocols. SMTP protocol is also easy to install and the ease of usage makes it one of the most popular email transmission protocols. With the use of the simple SMTP commands, any individual can check the efficiency of the SMTP protocol and check the mail transfer server. The flow of the message, both incoming and outgoing can be checked using the SMTP commands. You can check for any broken links by running such SMTP commands.
SMTP commands are run on a CMD prompt screen. You will have to first give the command prompt NSLOOKUP. And then set q=mx. This will deliver the response which says that the MX has been non-authoritative. You will now have to connect to the port 25 to enable the SMTP commands. Usually TELNET is used to connect to the mail server. The mail server will be designated mail.theirdomain.com. Again open a CMD prompt screen and give in TELNET 25. You will now get the mail server greeting as the response.
In case the SMTP commands for the accessing of the port doesn’t give any response, this will usually be due to the blocking of the port 25 by your computer’s firewall system or the mail server might be irresponsive. Try with a different domain in such a case.
Once you have got through the mail server using the SMTP commands, you can now try sending an email. While using SMTP commands to test email, make sure that you do not use the Backspace key on your keyboard. Use the HELO or EHLO of the SMTP commands to initiate the SMTP conversation. Type in <<a>yourid.domain.com> rept to:<<>recepientemail@domain.com>data.quit
Use the greater than and less than brackets in the right place while giving in SMTP commands as the server works on these specifications. Type the SMTP commands very carefully without any mistakes.