For more about email queuing, read our blog post. If the mail fails to be delivered during the established term, it will be returned to the mail client. An MTA will recurrently try to send emails. This means that outgoing mail is put into a queue and waits for the recipient’s server response. Usually, MTAs use a store-and-forward model of mail handling. ![]() send auto-response messages if an email has failed to reach the destination.query the MX records and select a mail server to transfer emails.accept emails sent from mail user agents.For more on differences between these email protocols, read SMTP vs. The email sending is carried out using SMTP (or extended SMTP), and for the final stage (MDA to MUA), POP3 or IMAP4 is used. This is the email’s last stopover before it will be delivered to the recipient’s mailbox. Then it hits the mail delivery agent (MDA). The email can be forwarded to other MTAs if the recipient is not hosted locally. Check out our blog post about SMTP relay if you’re interested in details. ![]() That’s why mail transfer agents are often called mail relays. Once the MTA gets the email, relaying comes into play. The MUA is commonly known as an email client – an app you use to handle the email-related stuff. ![]() It receives an email from the mail/message submission agent (MSA), which, in turn, receives it from the mail user agent (MUA). How MTAs workĪn MTA is just an element of the email delivery process. A mail/message transfer agent (MTA) is a software that transfers emails between the computers of a sender and a recipient.
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