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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 ...
Mercury Mail Transport System (Mercury MTS) is a standards-compliant mail server developed by David Harris, who also develops the Pegasus Mail client. It was freeware prior to January 2007, but is now donationware for non-commercial and personal use, and shareware for other uses.
The Internet Message Access Protocol is an application layer Internet protocol that allows an e-mail client to access email on a remote mail server. The current version is defined by RFC 9051 . An IMAP server typically listens on well-known port 143, while IMAP over SSL/TLS (IMAPS) uses 993.
Webmail (or web-based email) is an email service that can be accessed using a standard web browser. It contrasts with email service accessible through a specialised email client software . Additionally, many internet service providers (ISP) provide webmail as part of their internet service package.
In 1999 Hotmail included an X-Originating-IP email header field that shows the IP address of the sender. [ 1 ] [ 2 ] As of December 2012, Hotmail removed this header field, replacing it with X-EIP (meaning encoded IP) with the stated goal of protecting users' privacy.
A voice messaging content type is defined in ITU-T Recs. F.440 and X.440. Exchange Server 2007 does not use the MTA object, and the X.400 connector (which must use the MTA) is gone in Exchange Server 2007. There are no longer any X.400 default proxy e-mail addresses in Exchange Server 2007. [3]
In 2011, MDaemon was the first email server to integrate BlackBerry Enterprise Server (BES) for on-premise small and medium-sized businesses. [7] Two years later, in 2013, MDaemon introduced Account Hijack Detection to address email account takeover attempts. [8] In 2023, MDaemon partnered with Spamhaus to protect business email communication. [9]
A message submission agent (MSA), or mail submission agent, is a computer program or software agent that receives electronic mail messages from a mail user agent (MUA) and cooperates with a mail transfer agent (MTA) for delivery of the mail. It uses ESMTP, a variant of the Simple Mail Transfer Protocol (SMTP), as specified in RFC 6409. [1]