Glossary

Common technical terms in email

Stay current and expand your email knowledge with our list of common technical terms.

Mail Transfer Agent (MTA)

A Mail Transfer Agent (MTA) is an email server software that receives and relays emails. An MTA receives messages from another MTA or from a Mail User Agent (MUA), which is a computer application that end users use to access or send emails. Once an MUA relays an email to an MTA, the MTA takes over and sends it to the receiving MTA via Simple Mail Transfer Protocol (SMTP). If the sender seems spammy, inbox service providers (ISPs) will restrict the email delivery, potentially impacting the brand’s deliverability.

We recommend setting up authentication protocols to maintain high deliverability and help MTAs ferry emails from the MUA through mail servers and to the recipient’s MUA.

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Looping mail