What protocol does RFC 2821 define?

RFC 2821: Simple Mail Transfer Protocol – Wikidata.

What is MSA and MTA?

A message submission agent (MSA), or mail submission agent, is a computer program or software agent that receives electronic mail messages from a mail user agent (MUA) and cooperates with a mail transfer agent (MTA) for delivery of the mail.

What mail protocol is used to send mail messages to a server?

The Simple Mail Transfer Protocol (SMTP)
The Simple Mail Transfer Protocol (SMTP) is used to deliver e-mail messages over the Internet. This protocol is used by most e-mail clients to deliver messages to the server, and is also used by servers to forward messages to their final destination.

What is SMTP user agent?

Explanation: The user agent is basically a software program that allows the user to send, and receive e-mail messages. Routing of the message is done by the Message Transfer Agent.

How email is transferred?

Once an email is composed and the send button is clicked, the message is sent to the Mail Transfer Agent (MTA). This communication is done via the Simple Mail Transfer Protocol (SMTP). The SMTP queries the Domain Name System (DNS) to find the address of the recipient.

What is the meaning of Post Office Protocol?

The Post Office Protocol (POP) service is a network server by which client-based e-mail programs are connected to access a user’s e-mail on a central server. POP servers appear commonly on an Internet service provider’s (ISP’s) network, to provide e-mail delivery to customers.

What is MUA MTA and MDA?

MUA (Mail User Agent) MSA (Mail Submission Agent) MTA (Mail Transfer Agent) MDA (Mail Delivery Agent)

What is MX record DNS?

A DNS ‘mail exchange’ (MX) record directs email to a mail server. The MX record indicates how email messages should be routed in accordance with the Simple Mail Transfer Protocol (SMTP, the standard protocol for all email). Like CNAME records, an MX record must always point to another domain.

What is IMAP vs SMTP?

What is the difference between IMAP and SMTP? IMAP is for the retrieval of emails and SMTP is for the sending of emails. That means IMAP talks to both the client and server to get emails, and SMTP talks only to servers to send emails.

What is MTA in SMTP?

A mail server — also known as a mail transfer agent, or MTA; mail transport agent; mail router; or internet mailer — is an application that receives incoming email from local users and remote senders and forwards outgoing messages for delivery.

What is MUA in mail server?

Definition(s): A mail client application used by an end user to access a mail server to read, compose, and send email messages. Common MUAs include Microsoft Outlook and Mozilla Thunderbird.