Courier (also known as Courier Email) was an
email client
An email client, email reader or, more formally, message user agent (MUA) or mail user agent is a computer program used to access and manage a user's email.
A web application which provides message management, composition, and reception functio ...
for
Microsoft Windows
Windows is a group of several proprietary graphical operating system families developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. For example, Windows NT for consumers, Windows Server for ...
. The software was originally released in 1996 as Calypso by Micro Computer Systems (MCS).
Courier supported the
POP3
In computing, the Post Office Protocol (POP) is an application-layer Internet standard protocol used by e-mail clients to retrieve e-mail from a mail server. POP version 3 (POP3) is the version in common use, and along with IMAP the most common ...
,
IMAP
In computing, the Internet Message Access Protocol (IMAP) is an Internet standard protocol used by email clients to retrieve email messages from a mail server over a TCP/IP connection. IMAP is defined by .
IMAP was designed with the goal of per ...
and
SMTP
The Simple Mail Transfer Protocol (SMTP) is an Internet standard communication protocol for electronic mail transmission. Mail servers and other message transfer agents use SMTP to send and receive mail messages. User-level email clients ty ...
protocols, provided several features for HTML security and allowed to use multiple e-mail accounts from one mailbox. Version 3.0 introduced html support and improved message security in comparison to version 2.0, however some features were not yet supported for html messages.
In 1998 the MCS introduced another Calypso branded product, Calypso Message Center, intended for tracking and distributing messages for corporate customers.
The company abandoned further development of Calypso, which was acquired in 2003 by RoseCitySoftware. This led to freeware release of version 3.3 and name change of the next shareware version 3.5 to Courier.
An upgrade path was negotiated with PocoSystems to add Courier-type features to
Pocomail and direct Courier users to migrate to PocoMail 4.8 as a replacement for Courier 3.5. Free versions of the unfinished beta, requiring no registration, were available at the Yahoo Courier user group.
As of June 2021 the software is not available for download from official sources.
References
External links
Courier
{{DEFAULTSORT:Courier (E-Mail Client)
Email clients
Windows email clients