SMTP Routing Messages through Improved Passages

Your email messages traverse through numerous routes prior to finally reaching the recipient’s address. The first destination, an email makes a visit to is an SMTP server. Transmitting messages in an effective fashion would have hardly been possible in absence of an efficient-in-working but easy-to-understand simple mail transfer protocol. It is an excellent mechanism for mail transmission over a connection based transport service such as TCP/IP. Since 1980, this protocol has been a de facto standard of email transmission between a client and mail server.


The full form of SMTP is simple mail transfer protocol. It comprises of a set of limited commands and reply codes. This protocol was developed for the purpose of safe, fast and efficient message delivery. Instead of relying on a specific subsystem for mail transfer, this protocol heavily depends on a reliable data connection. A client computer builds up connection with the server via TCP port 25. However, in some cases, alternative port may also be used for efficient data delivery.


An easier, quicker and smoother mail transmission is a need to gain eluding attention from the prospective clients in business arena and stay in touch with the closed ones on personal level. Both promotional tactics and personal attachment bloom into lengthy and healthy bonding via superlative communication mechanism. SMTP is a tried and trusted mode to route mail through one or multiple relay hosts before the sent message is delivered to the destined destinations.


Using a handful of commands, a client stays in touch with the SMTP server. In fact, the protocol uses only 10 basic commands to create communication between the client and server. On the other hand, the server responses with both numerical codes and additional text messages. The replay codes are of immense importance and reflect the reality if the sent commands reach the destinations successfully or not. All the commands and reply codes are composed of ASCII characters. The normal width of each command is 4 though in some special cases, additional sub commands are attached with the primary commands. Every reply code has 3 digits. The reply code is followed by text, the length of which is a variable factor depending on the mail server involved in message transaction. Normally, the text length does not exceed 100 characters but the maximum limit is 508 characters. A space character is introduced to separate the numerical codes and text messages from each other.


Now let us plunge into the depth of this mail sending method. When a user sends mail through an SMTP server, the user mail application uses host resolution and TCP/IP in order to connect with the remote host mail server on TCP/IP. Host name resolution is a responsible party that resolves the name of remote host to an IP address. After that, TCP/IP sets up a connection between sending mail application and receiving mail application. The mail sending application then uses the limited list of simple commands for mail delivery to the receiving host. After the successful mail transfer, TCP/IP snaps the connection.