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A message transfer agent (MTA) is software that transfers email messages between computers using SMTP. Learn about MTA operation, protocols, and terms related to email delivery and access.
An e-mail agent is a program that is part of the e-mail infrastructure, from composition by sender, to transfer across the network, to viewing by recipient. The best-known are message user agents (MUAs, aka, e-mail clients) and message transfer agents (MTAs, programs that transfer e-mail between clients), but finer divisions exist.
A comprehensive table of mail servers for Unix, Windows, and macOS, with features, protocols, storage, license, and webmail support. Compare different mail transfer agents (MTAs), mail delivery agents, and other e-mail software.
Learn about the techniques and protocols to verify the origin of email messages and combat spoofing, phishing, and fraud. Compare SPF, DKIM, and DMARC, and see how they work with SMTP and DNS.
An email client is a computer program that accesses and manages a user's email. Learn how email clients retrieve messages from a mailbox, compose and submit messages, and use encryption to protect privacy.
AOL Mail offers secure and personalized email with features like AOL Mail, news, and weather for free. You can also access your email on the go with an iOS & Android app and get help from experts.
A MAILER-DAEMON message is an automatic notification that an email you sent was undeliverable and bounced back to you. Learn how to read the message, fix the delivery failure, and avoid being blocked by spam settings.
The same information in an RFC 5321 e-mail envelope - that is the SMTP info like MAIL FROM - would be: MAIL FROM:<not-for-mail@other.example> MAIL FROM:<@news.server.example:not-for-mail@other.example> The 1st step reflects the sender, the 2nd step the next MTA, etc.