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2. Comparison of mail servers - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_mail_servers

   A stock Unix-like server already has internal mail; more traditional ones also come with a full MTA already part of the standard installation. To allow the server to send external emails, an MTA such as Sendmail, Postfix, or Exim is required. Mail is read either through direct access (shell login) or mailbox protocols like POP and IMAP. Unix ...

3. List of mail server software - Wikipedia

   en.wikipedia.org/wiki/List_of_mail_server_software

   All such figures are necessarily estimates because data about mail server share is difficult to obtain; there are few reliable primary sources—and no agreed methodologies for its collection. Surveys probing Internet-exposed systems typically attempt to identify systems via their banner, or other identifying features. [ 1 ]

4. Comparison of webmail providers - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_webmail...

   The following tables compare general and technical information for a number of notable webmail providers who offer a web interface in English.. The list does not include web hosting providers who may offer email server and/or client software as a part of hosting package, or telecommunication providers (mobile network operators, internet service providers) who may offer mailboxes exclusively to ...

5. DomainKeys Identified Mail - Wikipedia

   en.wikipedia.org/wiki/DomainKeys_Identified_Mail

   DomainKeys Identified Mail (DKIM) is an email authentication method designed to detect forged sender addresses in email (email spoofing), a technique often used in phishing and email spam. DKIM allows the receiver to check that an email that claimed to have come from a specific domain was indeed authorized by the owner of that domain. [ 1 ]

6. Exim - Wikipedia

   en.wikipedia.org/wiki/Exim

   Exim has been deployed in busy environments, often handling thousands of emails per hour efficiently. Exim is designed to deliver email immediately, without queueing. However, its queue processing performance is comparatively poor when queues are large (which happens rarely on typical low-traffic sites but can happen regularly on high-traffic ...

7. Simple Mail Transfer Protocol - Wikipedia

   en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol

   The initiating host, the SMTP client, can be either an end-user's email client, functionally identified as a mail user agent (MUA), or a relay server's mail transfer agent (MTA), that is an SMTP server acting as an SMTP client, in the relevant session, in order to relay mail. Fully capable SMTP servers maintain queues of messages for retrying ...