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  2. Exim - Wikipedia

    en.wikipedia.org/wiki/Exim

    Exim is a mail transfer agent (MTA) used on Unix-like operating systems. Exim is a free software distributed under the terms of the GNU General Public License, and it aims to be a general and flexible mailer with extensive facilities for checking incoming e-mail.

  3. Microsoft Outlook - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Outlook

    Microsoft Outlook is a personal information manager software system from Microsoft, available as a part of the Microsoft 365 software suites. Though primarily being popular as an email client for businesses, Outlook also includes functions such as calendaring, task managing, contact managing, note-taking, journal logging, web browsing, and RSS news aggregation.

  4. Why did I receive an email from MAILER-DAEMON? - AOL Help

    help.aol.com/articles/what-is-a-mailer-daemon...

    When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you. These messages are sent automatically and often include the reason for the delivery failure.

  5. Zimbra - Wikipedia

    en.wikipedia.org/wiki/Zimbra

    The software consists of both client and server components, and at one time also offered a desktop email client, called Zimbra Desktop. Two versions of Zimbra are available: an open-source version, and a commercially supported version ("Network Edition") with closed-source components such as a proprietary Messaging Application Programming Interface connector to Outlook for calendar and contact ...

  6. Sender Rewriting Scheme - Wikipedia

    en.wikipedia.org/wiki/Sender_Rewriting_Scheme

    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.

  7. Microsoft Technology Associate - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Technology_Associate

    Microsoft Technology Associate was an entry-level certification that validates fundamental technology skills and knowledge in Microsoft products. MTA exams were designed to assess and validate core technical concepts in three primary areas: Databases ( MS SQL Server ), Development ( Visual Studio ) and IT Infrastructure ( Windows , Windows ...

  8. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    A "Basic Status Code" SMTP reply consists of a three digit number (transmitted as three numeric characters) followed by some text. The number is for use by automata (e.g., email clients) to determine what state to enter next; the text ("Text Part") is for the human user. The first digit denotes whether the response is good, bad, or incomplete:

  9. Postfix (software) - Wikipedia

    en.wikipedia.org/wiki/Postfix_(software)

    Postfix is a free and open-source mail transfer agent (MTA) that routes and delivers electronic mail. It is released under the IBM Public License 1.0 which is a free software license. Alternatively, starting with version 3.2.5, it is available under the Eclipse Public License 2.0 at the user's option. [2]