SMTP Email communication has two major stages. However, multiple SMTP ports can be used as per the different implementations of the email server. The importance of the SMTP port can be summed by stating the fact that if a user wants to send an email via Gmail etc., they must know both the IP address and port SMTP number of the Gmail SMTP Server. Due to this, email delivery also requires the use of the domain name system (DNS). In today’s world, where the port number of devices connected to the internet has increased drastically, it is not feasible for humans to remember the IP address of each of those devices. The mail servers then further relay or forward those emails to the recipient. These email clients run on the user’s computer and upload emails to mail servers. SMTP has become the global standard for email delivery, and it is used by applications such as Outlook client or Mozilla thunderbird. So the Simple Mail Transfer Protocol (SMTP) port will allow two or more mail servers to communicate with each other to send and receive emails. A port is a computer utility that allows separate computers to connect to a service and complete the network connection. Simple Mail Transfer Protocol (SMTPs), in simple words, is the protocol that facilitates email delivery across the internet. In this article, we will cover everything that is to know about SMTP ports and protocols. When configuring an email client application or an email server to send to relay emails, many questions come to one’s mind, such as which SMTPs should be used, what is the purpose of each of these ports, which are standard ports, which ports allow secure communication and many more.

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