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Courier is a modular multiprotocol mail server that's designed to
strike a balance between reasonable performance, flexibility and
features:
* Can be configured to function as an intermediate mail relay, or
as a mail server that receives mail for one or more domains, or
anything in between.
* Web-based administration and configuration tool.
* Uses an efficient maildir format as its native mail storage
format. Some support is provided for legacy mbox mailboxes.
* STARTTLS ESMTP extension (as well as IMAP/POP3/Webmail over SSL)
in both the client and the server (requires OpenSSL). The ESMTP
client can optionally require that the remote server's X.509
certificate is signed by a trusted root CA (a default set of
root CAs is provided).
* Mailboxes can be accessed via POP3, IMAP, SMAP, and HTTP.
* A faxmail gateway that forwards E-mail messages via fax.
* Courier includes a mailing list manager.
* PAM, LDAP, PostgreSQL, or MySQL authentication.
* Authenticated SMTP.
* Integrated mail filtering.
WWW: http://www.Courier-MTA.org/
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