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The comparison of mail servers covers mail transfer agents (MTAs), mail delivery agents, and other computer software that provide e-mail services.. Unix-based mail servers are built using a number of components because a Unix-style environment is, by default, a toolbox [1] operating system.
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 ...
agorum core; Apache James; Axigen; Bongo; Citadel/UX; CommuniGate Pro; Courier Mail Server; Cyrus IMAP server; Dovecot; Eudora Internet Mail Server; FirstClass ...
In particular, a properly secured SMTP mail relay should not accept and forward arbitrary e-mails from non-local IP addresses to non-local mailboxes by an unauthenticated or unauthorized user. In general, any other rules an administrator chooses to enforce (for instance, based on what an e-mail gives as its own envelope from address) must be in ...
Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over the Internet.
This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative ...
The traditional division is into client-side (MUA) and server-side (MTA, notably sendmail), with the flow given as: [17] MUA → MTA → … → MTA → MUA, Other divisions have been made to draw distinctions that some have found useful, which are detailed as follows.
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.