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SMTP – Simple Mail Transfer Protocol

However, SMTP is a method of communication use for email transmission. The communication takes place between two SMTP servers or between a mail client and an SMTP server (outgoing mail server).

Email communication by Mail Transfer Agents (MTAs). MTAs exchange information with one another via the SMTP protocol.

POP and IMAP are the other two email exchange protocols in addition to SMTP. These two protocols, however, are solely used to gather emails or handle them online. On the other hand, SMTP is a communication protocol that also has email receiving and forwarding capabilities.

Email routing via SMTP and DNS

An email is forward to the destination SMTP server by the SMTP server once it has been received by an email client (SMTP client). The DNS protocol, like the HTTP and FTP protocols, is essential. Email has some notable DNS entries. These are the records of the mail exchange (MX records). These entries are used by the SMTP server to locate the destination SMTP server for the recipient email address’s specified domain.

The way emails are route is as follows: For the destination SMTP server, the SMTP server asks a DNS server for a list of mail servers that accept email. A priority is given to each of these mail servers (Mail Exchange). The SMTP server makes attempts to reach the mail server in the prescribed order.

Disadvantages of SMTP

SMTP has a number of severe shortcomings. On the one hand, emails sent do not receive a shipping confirmation reply. Neither the sender nor the recipient will receive notification if an email is lost.

The SMTP specification stipulates that the sender must be notified if an email cannot be deliver. Standardized error messages have an SMTP extension, but not all SMTP servers support it. Most undeliverable emails just include the header of the email sent and an error message that is more or less readable in English.

Lack of user authentication during connection establishment between the SMTP client and SMTP server is another issue with SMTP. It implies that while sending an email, any sender address can be specified. In reality, it seems like a lot of

Structure of an email

A message comprises three components. The recipient and return addresses that the MTA demands are on the envelope. The header that contains details about the email client and the message ID comes next. It consists of a numeric and alphabetic combination, followed by the sender’s host address (domain). The email message’s text can be found in the body.

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